Vijaya and Jaya (Vishnu)

Gatekeepers of Vishnus. They once offended four sages who cursed them for being born as human beings on earth. Vishnu gave them a choice: You can experience seven births as my devotees or three as my enemies whom I will kill. They chose the latter and were born as

Hiranyaksha (Jaya) and Hirayakashipu (Vijaya)  Vishnu killed them as Varaha und Narasimha
Ravana (Jaya) and Kumbhakarna (Vijaya)           Vishnu killed them as Rama
Shishupala (Jaya) and Dantavakra (Vijaya)         Vishnu killed them as Krishna

The story starts with the Varaha Avatar
http://hindumythologyforgennext.blogspot.com/2011/12/varaha-avatar.html