Wankaner State was founded in 1620 by Raj Sartanji, son of Prathirajji, eldest son of Raj Chandrasinghji of Halvad (1584–1628).[citation needed]
In 1807 Wankaner State became a British protectorate when Maharana Raj Sahib Chandrasinhji II Kesarisinhji signed a treaty with the British. In 1862 the ruler of the state received a sanad giving the monarch authorization to adopt an heir. The ruler acceded to the Indian Union on 15 February 1948.[citation needed]