The Junagarh inscription goes on to tell us that during the reign of Rudra-daman, in the year 72 of the Saka era, there occurred a terrible storm. What would be the time in CE of the occurrence of that terrible storm?

1. Major Eras in Ancient Indian Chronology (basic)

In history, chronology acts as the backbone that holds events together. In ancient India, kings and emperors often marked the beginning of their reign or a significant victory by establishing a new Era (or Samvatsar). For a UPSC aspirant, understanding these eras is not just about dates; it is about learning how to translate ancient records into our modern calendar, the Common Era (CE). If you ever see an inscription from a thousand years ago, it won't say "1000 CE"—it will use a specific local era, and you must know the "conversion factor" to place it correctly in time.

The most vital era for us is the Saka Era. It is widely accepted by historians to have commenced in 78 CE. Traditionally, this era is associated with the Kushana king Kanishka, who was a patron of Buddhism and organized the fourth Buddhist Council History, Class XI (Tamilnadu state board 2024 ed.), Chapter 6: Polity and Society in Post-Mauryan Period, p. 80. To convert a Saka date to a CE date, you simply add 78 to the Saka year. For instance, if an inscription is dated to Saka year 72, we calculate 72 + 78 = 150 CE. This specific math helps historians date the famous Junagarh rock inscription of the ruler Rudradaman I.

Other significant chronological markers include the Vikrama Era (starting 57-58 BCE) and the Gupta Era. The Gupta Era is typically dated to 319-320 CE, marking the rise of the Gupta dynasty, often called the 'Classical Age' of Indian history Exploring Society: India and Beyond, Social Science-Class VII . NCERT (Revised ed 2025), The Gupta Era: An Age of Tireless Creativity, p. 145. Meanwhile, in South India, the Sangam Period serves as a cultural and political anchor, generally spanning from the 3rd century BCE to the 3rd century CE, though recent archaeological findings suggest its roots might be even older History, Class XI (Tamilnadu state board 2024 ed.), Evolution of Society in South India, p. 66.

Sources: History , class XI (Tamilnadu state board 2024 ed.), Chapter 6: Polity and Society in Post-Mauryan Period, p.80; Exploring Society:India and Beyond ,Social Science-Class VII . NCERT(Revised ed 2025), The Gupta Era: An Age of Tireless Creativity, p.145; History , class XI (Tamilnadu state board 2024 ed.), Evolution of Society in South India, p.66

2. The Origin and Significance of the Saka Era (basic)

In the tapestry of Indian history, the Saka Era (also known as Shaka Samvat) stands as one of the most vital chronological markers for dating ancient events and inscriptions. While it bears the name of the Sakas (Indo-Scythians), historical consensus largely attributes its commencement to the Kushana King Kanishka in 78 CE to mark the beginning of his reign History, class XI (Tamilnadu state board 2024 ed.), Polity and Society in Post-Mauryan Period, p.80. It is a fascinating historical irony: the era was likely inaugurated by a Kushana ruler, but it became known as the 'Saka era' because it was extensively used for centuries by the Western Kshatrapas (Saka rulers) in their administrative records and rock inscriptions across Western India. To master ancient chronology, one must know how to convert these dates into the Common Era (CE). The Saka Era is 78 years behind the Gregorian calendar Exploring Society: India and Beyond, Social Science-Class VII, NCERT(Revised ed 2025), The Age of Reorganisation, p.135. Therefore, the conversion formula is straightforward: Saka Year + 78 = CE Year. For example, if a famous inscription, such as that of the ruler Rudradaman I, is dated to the Saka year 72, we calculate 72 + 78 to arrive at 150 CE. Beyond its ancient utility, the Saka Era remains deeply relevant today. Recognizing its historical continuity and cultural resonance, the Government of India adopted it as the Indian National Calendar in 1957 Exploring Society: India and Beyond, Social Science-Class VII, NCERT(Revised ed 2025), The Age of Reorganisation, p.135. This transition from a tool used by ancient Central Asian dynasties to a symbol of modern Indian identity highlights its enduring significance in the subcontinent's political and social evolution.

Sources: History, class XI (Tamilnadu state board 2024 ed.), Polity and Society in Post-Mauryan Period, p.80; Exploring Society: India and Beyond, Social Science-Class VII, NCERT(Revised ed 2025), The Age of Reorganisation, p.135

3. The Western Kshatrapas (Sakas) of Malwa and Gujarat (intermediate)

The Western Kshatrapas were a branch of the Sakas (Scythians), Central Asian nomadic tribes who migrated into the Indian subcontinent. While they initially served as provincial governors under the Kushans, they eventually established an independent and powerful kingdom covering Malwa, Gujarat, and parts of Rajasthan. These rulers adopted the title Kshatrapa (Satraps) or Mahakshatrapa, showing their transition from regional administrators to sovereign monarchs History, class XI (Tamilnadu state board 2024 ed.), Chapter 6, p.80. Their reign is a fascinating study of how 'outsiders'—often labeled as mlechchhas by contemporary Brahmanas—successfully integrated into the Indian socio-political fabric through patronage of local traditions and strategic marital alliances.
The most illustrious ruler of this dynasty was Rudradaman I (c. 130–150 CE). He is immortalized by the Junagadh (Girnar) Rock Inscription in Gujarat, which is historically significant for being one of the first major inscriptions composed in classical Sanskrit rather than the then-prevalent Prakrit THEMES IN INDIAN HISTORY PART I, History CLASS XII (NCERT 2025 ed.), Chapter 3, p.63. This inscription records his repair of the Sudarshana Lake, a vital irrigation reservoir originally built during the Mauryan era, which had been destroyed by a massive storm. Rudradaman took pride in funding this public work from his own treasury without taxing the people, projecting himself as a benevolent and righteous 'Indian' king.
Politically, the Western Kshatrapas were locked in a long-standing rivalry with the Satavahanas of the Deccan. Although Rudradaman famously defeated the Satavahana ruler in battle, the relationship was complex; he also entered into a marriage alliance with them History, class XI (Tamilnadu state board 2024 ed.), Chapter 6, p.80. This mix of conflict and kinship was a hallmark of post-Mauryan political chronology.

Sources: History, class XI (Tamilnadu state board 2024 ed.), Polity and Society in Post-Mauryan Period, p.80; THEMES IN INDIAN HISTORY PART I, History CLASS XII (NCERT 2025 ed.), Kinship, Caste and Class, p.63

4. Evolution of Epigraphy: From Prakrit to Sanskrit (intermediate)

To understand the political history of ancient India, we must look at how kings communicated their power through Epigraphy (the study of inscriptions). In the early period, such as during the Mauryan Empire, inscriptions were written in Prakrit—the vernacular language of the common people—to ensure the royal message reached everyone History, Class XI (Tamilnadu state board 2024 ed.), Evolution of Society in South India, p.63. However, a fascinating shift occurred around the 2nd century CE. Kings began using Sanskrit, which was then considered the language of the elite and high culture, to document their achievements and land grants. This transition reflects a change in political strategy: from speaking to the people to speaking about the king's divine and cultural legitimacy.

The true 'turning point' in this evolution is the Junagarh (or Girnar) rock inscription of the Saka ruler Rudradaman I. Dated to 150 CE (Saka year 72), this is the first major long inscription written in chaste Sanskrit. It records the repair of the Sudarshana Lake dam after a terrible storm. By the time of the Gupta Empire in the 4th century CE, Sanskrit had become the standard language for royal Prashastis (eulogies). A prime example is the Allahabad Pillar Inscription, where the poet Harisena used sophisticated Sanskrit to describe the conquests of Samudragupta History, Class XI (Tamilnadu state board 2024 ed.), The Guptas, p.89.

As we move toward the 7th century and beyond, especially in South India, we see a 'hybrid' model. Royal records, often engraved on copper plates, became bilingual. The introductory part (genealogy and praise for the king) remained in Sanskrit, while the technical details of the land grant—intended for local administration—were written in regional languages like Tamil, Kannada, or Telugu THEMES IN INDIAN HISTORY PART I, History CLASS XII (NCERT 2025 ed.), Kings, Farmers and Towns, p.40. For instance, the Chalukyas at Badami explicitly distinguished between Kannada as the prakrit (local tongue) and Sanskrit as the language of high culture History, Class XI (Tamilnadu state board 2024 ed.), Cultural Development in South India, p.120.

Sources: History, Class XI (Tamilnadu state board 2024 ed.), Evolution of Society in South India, p.63; History, Class XI (Tamilnadu state board 2024 ed.), The Guptas, p.89; THEMES IN INDIAN HISTORY PART I, History CLASS XII (NCERT 2025 ed.), Kings, Farmers and Towns, p.40; History, Class XI (Tamilnadu state board 2024 ed.), Cultural Development in South India, p.117, 120

5. Sudarshana Lake: A Multi-Dynastic Engineering Marvel (intermediate)

The Sudarshana Lake, located in the Girnar region of Gujarat, stands as one of the most remarkable examples of ancient Indian hydraulic engineering and statecraft. Unlike natural lakes found in the Himalayas, this was an artificial reservoir constructed in a semi-arid region to ensure agricultural stability Environment, Shankar IAS Academy, Aquatic Ecosystem, p.35. Its history spans nearly eight centuries, illustrating a rare continuity of administrative responsibility across three major dynasties: the Mauryas, the Sakas (Western Kshatrapas), and the Guptas.

The story begins around 300 BCE during the reign of Chandragupta Maurya. According to historical records, the lake and its complex system of embankments and water channels were commissioned by his provincial governor (Rashtriya), Pushyagupta History, class XI (Tamilnadu state board 2024 ed.), Emergence of State and Empire, p.47. This highlights that even the earliest Indian empires prioritized sophisticated irrigation systems to manage water resources for their subjects NCERT, Contemporary India II, p.56.

The lake’s most famous historical record, however, is the Junagadh (or Girnar) Rock Inscription of the Shaka ruler Rudradaman I, dated to approximately 150 CE. This inscription is significant for two reasons: first, it is one of the earliest long inscriptions written in classical Sanskrit; second, it records how a catastrophic storm breached the lake's dam, causing the water to gush out THEMES IN INDIAN HISTORY PART I, Kings, Farmers and Towns, p.38. Rudradaman I took it upon himself to repair the lake using his own resources without imposing additional taxes on his people—a move clearly intended to project the image of a benevolent and capable monarch.

To determine the exact date of Rudradaman's repair, historians look at the inscription's reference to the Saka year 72. Since the Saka era is widely accepted to have begun in 78 CE, we add 72 to 78, confirming the date as 150 CE History, class XI (Tamilnadu state board 2024 ed.), Polity and Society in Post-Mauryan Period, p.80. The lake's final recorded restoration occurred in the 5th century during the Gupta period, proving that for nearly a millennium, Indian rulers viewed the maintenance of the Sudarshana Lake as a vital duty of the state.

Sources: Environment, Shankar IAS Academy, Aquatic Ecosystem, p.35; History, class XI (Tamilnadu state board 2024 ed.), Emergence of State and Empire, p.47; THEMES IN INDIAN HISTORY PART I, Kings, Farmers and Towns, p.38; History, class XI (Tamilnadu state board 2024 ed.), Polity and Society in Post-Mauryan Period, p.80; NCERT, Contemporary India II, Water Resources, p.56

6. Historical Details of the Junagarh Rock Inscription (exam-level)

The Junagarh Rock Inscription, also known as the Girnar Inscription, is one of the most vital epigraphic records for understanding the political chronology of ancient India. Located in Gujarat, this massive rock serves as a historical "ledger," bearing edicts from three different dynasties: the Mauryas, the Sakas, and the Guptas. The most detailed portion was carved during the reign of the Saka (Western Kshatrapa) ruler Rudradaman I, who ruled approximately between 130 and 150 CE History, Class XI (Tamilnadu state board), Chapter 6, p.80.

For a student of history, the inscription’s dating is a masterclass in ancient calendars. It explicitly mentions the Saka year 72. To convert this to the Common Era (CE), we add 78 years—the year the Saka era is believed to have commenced—resulting in 150 CE (72 + 78 = 150). This precision allows historians to pin Rudradaman’s activities to a specific window in the second century CE. Beyond dates, the inscription is culturally revolutionary; it is one of the earliest and most extensive records written in classical Sanskrit rather than the Prakrit typically used in earlier royal edicts Themes in Indian History Part I, Class XII (NCERT), Chapter 3, p.63.

The primary narrative of the inscription concerns the Sudarshana Lake, a massive artificial reservoir. After a devastating storm caused the dam to burst, Rudradaman ordered its repair out of his own private resources, without taxing his subjects. Interestingly, the inscription looks backward in time to provide administrative context, mentioning that the lake was originally constructed by Pushyagupta, a provincial governor under the Mauryan Emperor Chandragupta History, Class XI (Tamilnadu state board), Chapter 4, p.47. This demonstrates a remarkable sense of historical continuity and administrative record-keeping that spanned nearly four centuries.

Sources: History, Class XI (Tamilnadu state board), Polity and Society in Post-Mauryan Period, p.80; Themes in Indian History Part I, Class XII (NCERT), Kinship, Caste and Class, p.63; History, Class XI (Tamilnadu state board), Emergence of State and Empire, p.47

7. Solving the Original PYQ (exam-level)

This question bridges your understanding of ancient Indian epigraphy and the chronological systems used by the Indo-Scythians. You have recently studied the Junagarh Rock Inscription as a primary source for the Western Kshatrapas, specifically the reign of Rudradaman I. As noted in History, class XI (Tamilnadu state board 2024 ed.), this inscription is famous not only for being the first major inscription in "chaste" Sanskrit but also for recording the repair of the Sudarshana Lake after a catastrophic storm. To solve this, you must apply the conversion rule for the Saka Era, which is the building block that connects the historical event to the modern calendar.

To find the correct date, you simply need to perform a chronological conversion: take the year mentioned in the inscription and add the starting year of the era. Since the Saka era is widely held to have commenced in 78 CE, and the inscription specifies the year 72, the calculation is 72 + 78 = 150. Therefore, the "terrible storm" occurred in (A) 150 CE. This year marks the conclusion of Rudradaman’s reign, which historians generally date between 130 and 150 CE. By grounding your mathematical calculation in this historical context, you can confirm that the answer is logically sound.

UPSC often uses plausible-sounding dates as distractors to test your precision. Option (C) 130 CE is a common trap because it represents the estimated beginning of Rudradaman's reign, rather than the specific date of the storm. Options like (B) 181 CE or (D) 120 CE are designed to catch students who might confuse the Saka Era (78 CE) with the Vikram Era (57 BCE) or who make simple arithmetic errors. Always remember: when you see "Saka Era" in a pre-modern context, think +78 to transition accurately to the Common Era.