Vijayanagar Empire, also known as the Kingdom of Bisnaga, was one of the most powerful and prosperous empires in South India during the 14th to 16th centuries. It was established in 1336 by Harihara I and Bukka Raya I, two brothers who were originally commanders in the Kakatiya dynasty.

The Vijayanagar Empire expanded its influence by gradually subjugating neighboring regions and kingdoms. After consolidating their power in the Deccan region, the Vijayanagar rulers set their sights on the southern region, particularly the Sultanate of Madurai, which was a powerful and wealthy kingdom at the time.

Harihara II, the son of Bukka Raya I, played a significant role in the expansion of the Vijayanagar Empire. He succeeded his father as the ruler and further strengthened the empire by eliminating the Sultanate of Madurai. This conquest allowed the Vijayanagar Empire to gain control over a vast territory in southern India.

Devaraya I, the son of Harihara II, continued the policies of his father and embarked upon a policy of expansion towards the eastern coast. He sought to extend Vijayanagar's influence and control over the rich coastal regions, which were known for their trade and maritime activities. By expanding towards the eastern coast, the empire could gain access to valuable resources, establish trade routes, and further increase its economic and political power.

However, it was Krishnadeva Raya, the most famous and successful ruler of the Vijayanagar Empire, who truly implemented this policy of expansion towards the eastern coast. Krishnadeva Raya ruled from 1509 to 1529 and is considered the empire's golden age. He not only consolidated the empire's territories but also expanded its influence through military campaigns and diplomatic alliances.

Under Krishnadeva Raya's rule, the Vijayanagar Empire reached its zenith and became a major power in South India. His successful military campaigns against the Gajapati Kingdom of Orissa and the Bahmani Sultanate further extended the empire's control over the eastern coast.

In conclusion, while Harihara II and Devaraya I played important roles in expanding the Vijayanagar Empire's influence, it was Krishnadeva Raya who truly implemented the policy of expansion towards the eastern coast. His successful military campaigns and strategic alliances helped the empire strengthen its position and establish control over the coastal regions.