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Early years

In the first two decades after the founding of the empire, Harihara I gained control over most of the area south of the Tungabhadra River and earned the title of "master of the eastern and western seas" (Purvapaschima Samudradhishavara). By 1374 Bukka Raya I, successor to Harihara I, defeated the chiefdom of Arcot, the Reddys of Kondavidu, and the Sultan of Madurai, and had gained control over Goa in the west and the Tungabhadra- Krishna River doab in the north. The original capital of the empire was in the principality of Anegondi on the northern banks of the Tungabhadra River in today's Karnataka. It was moved to Vijayanagara during Bukka Raya I's reign because it was easier to defend against the Muslim armies, who were persistently attacking from the northern lands.

With the Vijayanagara Empire now imperial in stature, Harihara II, the second son of Bukka Raya I, further consolidated the empire beyond the Krishna River and South India was controlled by the Vijayanagara Empire. The next ruler, Deva Raya I, was successful against the Gajapatis of Odisha and undertook works of fortification and irrigation. Firuz Bahmani of Bahmani Sultanate entered into a treaty with Deva Raya I in 1407 that required the latter to pay Bahmani an annual tribute of "100,000 huns, five maunds of pearls and fifty elephants". The Sultanate invaded Vijayanagara in 1417 when the latter defaulted in paying the tribute. Such wars for tribute payment by Vijayanagara were repeated in the 15th century.

Deva Raya II (eulogized in contemporary literature as Gajabetekara) succeeded to the throne in 1424. He was possibly the most successful of the Sangama Dynasty rulers. He quelled rebelling feudal lords and the Zamorin of Calicut and Quilon in the south. He invaded Sri Lanka and became overlord of the kings of Burma at Pegu and Tanasserim. By 1436 the rebellious chiefs of Kondavidu and the Velama rulers were successfully dealt with and had to accept Vijayanagara overlordship. After a few years of tranquility, wars broke out with the Bahamani Sultanate in 1443 with some successes and some reversals. The Persian visitor Firishta attributes Deva Raya II's war preparations, which included augmenting his armies with Muslim archers and cavalry, to be the cause of the conflict. Contemporary Persian ambassador Abdur Razzak attributes the war to the Bahamani Sultan capitalizing on the confusion caused by an internal revolt within the Vijayanagara Empire, including an attempt to assassinate the Raya by his brother.

Deva Raya II was succeeded by his elder son Mallikarjuna Raya in 1446. The Gajapati emperor removed the Vijayanagara control over the Tamil country by occupying the Reddi kingdoms of Rajahmundry, Kondaveedu, Kanchipuram, and Tiruchirapalli. These defeats reduced the Vijayanagara Empire's prestige, described by an inscription which described the Gajapati king as "a yawning lion to the sheep of the Karnatak King". Mallikarjuna's successor Virupaksha Raya II led a life of pleasure perusing wine and women leading to the loss of Goa and much of Karnataka to the Bahmani Sultanate. His governor Saluva Narasimha reduced the loss of territory by holding almost all of coastal Andhra Pradesh south of the Krishna river, Chittoor, the two Arcots and Kolar. Saluva Narashimha defeated the Gajapatis and held Udayagiri, drove out the Pandyas from Tanjore, and took procession of Machilipatnam and Kondaveedu. He later defeated Bahmani forces and recovered most of the empire's earlier losses.

After the death of Virupaksha Raya II in 1485, Saluva Narasimha led a coup that ended the dynastic rule while continuing to defend the empire from raids by the Sultanates created from the continuing disintegration of the Bahmani Sultanate in its north. Saluva Narasimha left his two adolescent sons under the care of general Tuluva Narasa Nayaka who ably defended the empire from their traditional enemies, the Gajapati king and the Bahamani Sultan. He also subdued rebelling chiefs of the Chera, the Chola and the Pandya territories. Despite many attempts by nobles and members of the royal family to overthrow him, Narasa Nayaka retained control as regent till 1503.

In 1503, Narasa Nayaka's son Vira Narasimha had prince Immadi Narasimha of the Saluva dynasty assassinated and took over the rule in a coup thus becoming the first of the Tuluva dynasty rulers. This did not go well with the nobles who revolted. Seeing internal troubles grow, the Gajapati king and the Bahamani Sultan began to encroach on the empire even as the governors of Ummattur, Adoni, and Talakad colluded to capture the Tungabhadra-Krishna river doab region from the empire. The empire came under the rule of Krishna Deva Raya in 1509, another son of Tuluva Narasa Nayaka. Initially Krishnadevaraya faced a many obstacles including dissatisfied nobles, the rebellious chief of Ummattur in the south, a resurgent Gajapati kingdom under King Prataparudra, a growing threat from the newly formed Adil Shahi Sultanate of Bijapur under Yusuf Adil Khan and Portuguese interest in controlling the west coast. Not one to be unnerved by these pressures he strengthened and consolidated the empire, one victory at a time. He was an astute ruler who hired both Hindus and Muslims into his army. In the following decades, the empire covered Southern India and successfully defeated invasions from the five established Deccan sultanates to its north.