**Founder of Nanda Dynasty: Mahapadma Nanda**

The Nanda Dynasty was a ruling dynasty in ancient India that existed from 345 BCE to 321 BCE. The founder of the Nanda Dynasty was Mahapadma Nanda. He was the first king of this dynasty and established a powerful empire in northern India.

**Details about Mahapadma Nanda:**

1. Rise to Power: Mahapadma Nanda was not born into a royal family. He was a low-caste kingmaker who rose to power through his military and political skills. He overthrew the last king of the Shishunaga Dynasty and established the Nanda Dynasty in Magadha, which is present-day Bihar.

2. Consolidation of Power: After establishing his rule, Mahapadma Nanda focused on consolidating his power and expanding his empire. He defeated several neighboring kingdoms and absorbed them into his empire. He was known for his ruthless and authoritarian rule.

3. Administration and Policies: Mahapadma Nanda was a formidable ruler who implemented various administrative and policy reforms. He established a centralized administration system and divided his empire into administrative units called "Mahamatriyas." He also introduced a new tax system and implemented land reforms.

4. Military Expansion: Under Mahapadma Nanda's rule, the Nanda Dynasty became a major military power in ancient India. He maintained a large and well-equipped army, which helped him conquer and annex several neighboring territories.

5. Decline and Succession: Mahapadma Nanda ruled for around 28 years and expanded his empire significantly. However, after his death, the Nanda Dynasty faced internal conflicts and external invasions. This eventually led to its downfall, and the Maurya Dynasty, under the leadership of Chandragupta Maurya, emerged as the new ruling dynasty in northern India.

In conclusion, Mahapadma Nanda was the founder of the Nanda Dynasty. He was a skilled military and political leader who rose from a low-caste background to establish a powerful empire in northern India. His rule was marked by consolidation of power, administrative reforms, military expansion, and subsequent decline leading to the rise of the Maurya Dynasty.

Mahabadma nanda overthrew the shishunaga dynasty and established nanda dynasty so Mahabadma nanda is correct answer