Usagi family

The Ujina family are the ruling family of the Hare Clan. (3E p. 67)

Founding
The Ujina family, and Hare Clan, were founded in 750 by the ronin] Reichin as a reward for his services against Iuchiban. (3E p. 15, 67)

Daimyo
Since the founding of the Hare Clan the daimyo of the Usagi has also been the Hare Clan Champion.