Jayan and Vijayan, the two gatekeepers of Lord Vishnu, were quite arrogant in nature and treated a saint with disrespect, thus receiving a curse that they will be born as mortals and spend their lives on Earth, and eventually be killed by Vishnu himself. Hence, they were incarnated as Hiranyakashipu and Hiranyaksha in Satya Yugam, Ravanan and Kumbhakarnan in Treta Yugam, and finally Shishupalan and Dantavakran in Dvapara Yugam.
