[2] The assassination of their capable father, the Imperial Regent Tuluva Narasa Nayaka resulted in feudatories rising in rebellion everywhere.
The Turko-Persian Sultan Yusuf Adil Khan of Bijapur who assassinated the Regent Narasa Nayaka and 40 other imperial officers tried to extend his domains south of the Tungabhadra.
During this time, the governor of Ummathur rose again in revolt and Vira Narasimha Raya set out south to quell the rebellion, having placed his half-brother Krishnadevaraya as the emperor in absence.
Portuguese Empire assisted Emperor Vira Narasimha's forces in this conflict, providing horses and artillery, in exchange seeking control of the port of Bhatkal.
However, there is no record to prove anything but a friendly relationship between the two half brothers and that the coronation of Krishna Deva Raya was a smooth one.