Lord Venkateswara : Lord Venkateshwara is an incarnation of Lord Vishnu. The main reasons for the Venkateswara incarnation is to save the humans from the clutches of this dark age Kaliyug, and give an opportunity to devote to his Lotus feet. In Lord Krishna’s avatar, his mother Yashoda doesn't attend any of Krishna’s marriages, so she asks a boon that, at least in his next incarnation, she want to see and perform his marriage; this was fulfilled by Lord vishnu during his incarnation as Lord Venkateswara