The Mera clan was a descendant of the Kikuchi clan, a distinguished clan that supported the Southern Court (in Japan) in the period of the Northern and Southern Courts (in Japan) and fled to the mountainous area of Kyushu, or more specifically, in Mt. Mera of Mera County, Higo Province, after being defeated in the war.
米良氏は、南北朝時代(日本)には南朝(日本)方につき、敗れた後、九州山地の肥後国米良郡米良山中に逃れた名族菊池氏の末裔である。