Tsingor

Tsingor was one of the ancient Oni clans. Tsingor consolidated its power over 1300 years ago and held onto a small land in the south for long centuries. Avoiding most military conflicts and keeping fairly peaceful relations with its neighbours, Tsingor remained a small and unassuming state until it helped Honshar in dismantling weakened Pheria 766 years ago.
Over two centuries later, 495 years ago, Honshar started abusing their friendly relationship with Tsingor, attempting to essentially vassalise the clan. Tsingor Emperors were offended by this turn of events and threatened Honshar with war (which was already fighting Roana). Honshar responded with military aggression and 494 years ago quickly annexed Tsingor.