Ujitada was born to TACHIBANA no Fuyuaki, who was Shosanmi (Senior Third Rank) dainagon (a chief councilor of state) and Chue no daisho (Major Captain of the Imperial Guard) and the imperial princess of Asuka in the era of Fujiwara no Miya and was known for his excellent looks and wit, and he assumed the position of shikibu shoyu (Junior Assistant of the Ministry of Ceremonies), ushoben (Minor Controller of the Right) and Nakatsukasa no Shosho (Minor Captain of the Ministry of Central Affairs) concurrently and his rank was Jugoinojo (Junior Fifth Rank, Upper Grade)at the age of sixteen.
藤原の宮の時、正三位大納言兼中衛大将橘冬明と明日香の皇女との間に生まれた氏忠は、容貌才覚共にすぐれ、16歳で、式部少輔右少弁中務少将を兼任、従五位上にあった。