[1] Honma Yoshihisa was appointed shugodai of Sado in 1185.

The clan gave birth to two new branches, the Hamochi-Honma and the Kawaharada-Honma.

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-Honma and Kawaharada-Honma.

His death sparked a new rows of hostilities between the two branches, but Uesugi Kagekatsu invaded Sado in 1589, putting an end to the ruling of the clan.