Sen Sōtan|千宗旦 (1578–1658), also known as Genpaku Sōtan 元伯宗旦, was the grandson of the famed figure in Japanese cultural history, Sen Rikyū. He is remembered as Rikyū's third-generation successor in Kyoto through whose efforts and, as the blood-descendant of Rikyū, the ideals and style of Japanese tea ceremony proposed by Rikyū were able to be passed forward by the family.
The Wikipedia page is [1]