Vanvir Singh

Vanvir Singh was the ruler of Mewar Kingdom between 1536 and 1540. He was allegedly the son of Prithviraj (elder brother of Rana Sanga) and a maid. 
He was appointed as the official ruler of the state when Vikramaditya Singh was imprisoned. Vanveer decided to kill the imprisoned Vikramaditya, and he also killed various ministers (Samantas) who were in his way. He attempted to kill the 14-year-old heir Udai Singh, but Udai Singh's nursemaid Panna Dai replaced the prince with her son Chandan who was killed instead. Vanveer declared himself to be the ruler of Mewar and Chittor. 
In 1540, when Udai Singh was 18 years old, he attacked Chittorgarh with the help of several Samantas together with Akhey Raj Songara, the ruler of Jalore and Udai Singh's father-in-law. The armies of Vanvir Singh and Udai Singh met at the battle field of Malvi (south of Chittorgarh). Vanvir was decisively defeated in the battle. It is unclear whether he was killed during the battle, sent into exile or executed right after it. Udai Singh was crowned the 12th Rana of Mewar. His eldest son Maharana Pratap from his first wife Maharani Jaivantabai Songara was born in the same year.