Khoon Ka Khoon (1966)

The story revolves around the life of Kesarsingh, a fearless and furious swordsman of the King who killed many enemies, leading him invincible, and appointed as the princess' bodyguard but he fell in love with her. They together ran away from the kingdom and started a new life but when she gets pregnant, he moved to another village and married a woman and changed his name. Years later, Lakhan, his son, comes to know the truth and visits his stepmother and brother, leading to consequences.