Shiva Simha Singh

Shiva Simha Singh, also known as Sivasimha, was a king of the Oiniwar dynasty in Mithila. He was also referred to as Rūpanārāyana. He declared himself independent and stopped paying taxes to Ibrahim Shah of Jaunpur Sultanate, who invaded Mithila but was defeated.

Mithila, Bengal and Arakanese accounts say that King Sivasimha helped another Brahmin ruler and his friend, Raja Ganesha of Bengal, defeating the Jaunpur Sultanate in Bengal-Jaunpur conflict. Ganesha had previously freed Bengal from Muslim occupation.