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The first person in this line of the Sen family to use the name Sōshitsu was the youngest son of Sen Sōtan; in other words, a great-grandson of Sen Rikyū.
The san-Senke derive from Sen Rikyū, and it was not until after the era of his grandson, Sen Sōtan, that the three separate lines of the family came into being.
According to A.L. Sadler, the earliest extant example of a space attached to a chashitsu (room intended for the tea ceremony) that is describable as a mizuya exists at the Taian, a chashitsu designed by Sen Rikyū.
The Omotesenke estate, known by the name of its representative tea room, the "Fushin-an" (不審庵), was where Sen Rikyū's son-in-law, Sen Shōan, reestablished the Kyoto Sen household after Rikyū's death.