Ema

The Ema clan claimed descent from the Kanmu Heishi line of Taira no Tsunemori. Its genealogy holds that his son Terutsune was raised by Hojo Tokimasa and took the name Ema from Ema manor in Tagata, Izu. The family moved to Takahara in Hida, where it grew into a kokujin house.

In the Sengoku period Ema Tokitsune built a domain in northern Hida and clashed with the Anegakoji and Miki. The Ema split between the Takeda and Uesugi camps: the Miki and Ema Terumori sided with the Uesugi, but in 1564 Ema Tokimori overwhelmed them with Takeda help, and Terumori submitted to the Takeda. After Uesugi Kenshin's Hida campaign of 1576 Terumori submitted to him, then to Oda Nobunaga.

In 1578 Terumori murdered Tokimori over succession. After Nobunaga's death in 1582 he was killed fighting the Anegakoji at Yokamachi, ending Ema independence; Tokimasa's remnant took refuge with the Kanamori but was destroyed in revolt.