[1] Kushadhvaja was born to King Hrasvaroman of Mithila and his wife Keikasi.
[3] Kushadhvaja was married to queen consort Chandrabhaga (Sanskrit: चंद्रभागा).
[6][7] He initially ruled the area around Rajbiraj His brother Janaka was the King of Mithila.
During his rein the King of Samkasya, called Sudhanvan, attacked Mithila.
Janaka killed Sudhanvan in the war, and crowned his brother Kushadhvaja as the King of Samkasya.