Mithila, Bengal and Arakanese accounts say that Brahmin ruler Sivasimha helped another Brahmin ruler, and his friend Raja Ganesha of Bengal, in defeating the Jaunpur Sultanate in Bengal-Jaunpur conflict.

Queen Lakhima Devi was the most famous and scholarly wife of the King Sivasimha.

He was actively taking part in the kingdom's administration since he was 15, when his father, King Devasimha, was alive.

He issued gold coins, two specimens of which were found at Pipra village of Champaran district in 1913.

He granted Bisfi village in the present Madhubani district to his friend Vidyapati for his poems Kirtilata and Kirtipataka.

In his copper plate grant to Vidyapati, he claimed to have won the kings of Gauda and Gajjanpur.