Jaya-Vijaya

[1][2] Due to a curse by the four Kumaras, they were forced to undergo multiple births as mortals who would be subsequently killed by various avatars of Vishnu.

According to a story from Bhagavata Purana, the Four Kumaras, Sanaka, Sanandana, Sanatana, and Sanatkumara, who are the manasaputras (mind-born children) of Brahma, visit Vaikuntha, the abode of Vishnu, to see him.

[8] In their first life during Satya Yuga, they were born as Hiranyaksha (Vijaya) and Hiranyakashipu (Jaya) to Diti (daughter of Daksha Prajapati) and sage Kashyapa.

In their second life during the Treta Yuga, they were born as Ravana (Jaya) and Kumbhakarna (Vijaya), and both were killed by Rama.

In their third life during Dvapara Yuga, they were born as Shishupala (Jaya) and Dantavakra (Vijaya) and both were killed by Krishna.

[9] It has been noted by many that the strengths of Jaya and Vijaya gradually declined with each subsequent birth due to the yuga effect.

In the modern era, known in Sanskrit and held in Hindu tradition as the Kali Yuga, Jaya and Vijaya are free from their curse, and they can be seen as gatekeepers in Vishnu temples affiliated with Vaishnavism.