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|Parent house||Yokoyama clan (purported)|
|Founding year||12th century|
|Ruled until||1589, defeat by Uesugi Kagekatsu|
Yoshihisa Homma was appointed shugodai of Sado in 1185. The clan established its rule from Sawata. The clan gave birth to two new branches, the Hamochi-Homma and the Kawaharada-Homma. Those two branches eventually prevailed over the head clan and opposed each other. Uesugi Kenshin, ruler of the Echigo Province at the time, settled the ongoing conflicts between Hamochi-Homma and Kawaharada-Homma. His death sparked a new rows of hostilities between the two branches, but Uesugi Kagekatsu invaded Sado in 1589, putting an end to the clan's rule.
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