The throne of the Vijayanagara Empire had passed from Achyuta Raya, upon his death, to Rama Raya, The Sultanates always being in constant fear of a much bigger Vijayanagara Empire united against it, which was seen as the common enemy.
The throne of the Vijayanagara Empire had passed from Achyuta Raya, upon his death, to Rama Raya, The Sultanates decided to unite and destroy the kingdom. Inter-family marriages between Sultans solved many of their internal conflicts and they finally united against the Vijayanagara empire, which was seen as the common enemy.