Career
He was the 14th generation lord of the Ashina (Sawara) family. He is also known as Heitarō (平太郎). Moritaka was born the son of Nikaidō Moriyoshi (二階堂 盛義), lord of Sukagawa Castle.
He was adopted by Ashina Morioki to continue the family line, and as per that arrangement, married Morioki"s daughter and had a son, Kiōmaru.
After Moritaka"s succession, he, became very unpopular among his retainers. This led to his assassination at the age of 24 at the hands of Ōba Sanzaemon (大庭 三左衛門).