Raja Maldeo was a ruler in the thirteenth century, a Chahar Jat, who ruled at Sidhmukh in Jangladesh (Bikaner). Ghulam Badshah was the then Muslim ruler of Delhi. Ghulam's army while returning from Jaisalmer clashed with Maldeo. It happened like this.
Two bulls were fighting. The Delhi army was watching it, but no one dared to stop them. It was then that Maldeo’s daughter, Somadevi came out and caught both the bulls by the horns and quietened them.
The Muslim ruler was so impressed that he asked for Somadevi’s hand in marriage. But Maldeo refused the offer. The ruler then tried to take away Somadevi forcefully.
This led to a bloody battle in which Maldeo, Somadevi and many Jats died. The location of the battle is said to be near the border of Sidhmukh. The remaining members of Maldeo's family migrated to the Jhunjhawati region (present-day Jhunjhunu).