The second-generation lord of Sendai-han, 18th head of the Date Clan, second son of Date Masamune. His mother, Megohime, daughter of Tamura Kiyoaki was the legal wife of Date Masamune, making Date Tadamune his father's eldest legitimate son. He became the lord of Sendai-han at 38 after his father's death.

He raised Sendai-han's social status greatly during his governance, and was called 'the wise enterprising lord'. He died at the age of 60 and was entombed in the Kansenden.