Because Yoshihisa had no sons and Tadatsune's elder brothers Tsurujumaru and Hisayasu died young, he married Yoshihisa's third daughter, Kameju, and became a successor as the head of the Shimazu clan. |
義久に男子無く、また、忠恒の兄(鶴寿丸・島津久保)が若くして死去したため、義久の三女である亀寿と結婚し、島津氏宗家の後継者となった。 |