Understanding the Haryanka Dynasty and Pataliputra's Founder

The question asks to identify the Indian ruler belonging to the Haryanka dynasty who was the son of Ajatashatru and is credited with founding the city of Pataliputra. To answer this, we need to recall the succession within the Haryanka dynasty and the historical context of important city foundations.

The Haryanka dynasty was an important ruling dynasty in ancient India, primarily centered in the region of Magadha. Key rulers of this dynasty included Bimbisara, his son Ajatashatru, and Ajatashatru's successor.

Analyzing the Ruler: Son of Ajatashatru

Ajatashatru was a powerful ruler who expanded the Magadha kingdom significantly. Historical texts indicate that Ajatashatru was succeeded by his son. This son is specifically named in various historical sources as the next ruler of the Haryanka dynasty.

Pataliputra: The Strategic Capital

The city of Pataliputra (modern-day Patna) became a crucial administrative and economic center in ancient India. Its location at the confluence of major rivers like the Ganga, Gandak, and Son made it strategically important for trade and defense. The foundation of this city marked a significant development in the urbanization of the Gangetic plains.

According to historical accounts, the ruler who succeeded Ajatashatru was responsible for laying the foundation of Pataliputra and shifting the capital from Rajagriha (Rajgir) to this new location, primarily for its strategic advantages, especially concerning control over trade routes and defense against potential invaders from the north.

Examining the Options

Let's look at the provided options:

• Pradyota: Pradyota was a ruler of Avanti (Ujjain), a contemporary rival kingdom to Magadha during the time of Bimbisara and Ajatashatru. He was not a ruler of the Haryanka dynasty of Magadha, nor was he the son of Ajatashatru.
• Udayin: Historical sources identify Udayin (also known as Udayabhadra) as the son and successor of Ajatashatru in the Haryanka dynasty. He is widely credited with founding the city of Pataliputra and making it the capital of Magadha.
• Mahanandin: Mahanandin was the last ruler of the Shishunaga dynasty, which succeeded the Haryanka dynasty. He was not part of the Haryanka lineage.
• Nandivardhana: Nandivardhana is associated with the Nanda dynasty, which succeeded the Shishunaga dynasty. He was not from the Haryanka dynasty.

Connecting the Dots: Udayin and Pataliputra

Based on historical evidence, Udayin fits the description perfectly. He was the son of Ajatashatru, belonged to the Haryanka dynasty, and founded the city of Pataliputra. This makes Udayin the correct answer.

Therefore, the ruler of the Haryanka dynasty who was the son of Ajatashatru and founded Pataliputra is Udayin.

Revision Table: Key Haryanka Dynasty Facts

Additional Information: Significance of Pataliputra

Pataliputra's foundation by Udayin marked a turning point in the history of Magadha. Its strategic location at the confluence of rivers made it easily defensible and facilitated trade along the riverine routes. It remained the capital for several major dynasties that ruled Magadha, including the Shishunagas, Nandas, Mauryas, Guptas, and others, for over a thousand years. Its importance highlights the strategic foresight of Udayin in selecting this site for his capital.