The January 7, 1186 entry in Kikki (a diary of Tsunefusa YOSHIDA) reads 'On this day, Tadafusa, the son of Komatsu-naifu (the title of his father) was summoned to the Kanto region' and on the entry for the 16th state that 'Tadafusa was beheaded.'
『吉記』には文治元年（1185年）12月8日の項に、「同日、小松内府息忠房招引関東事」とあり、16日に「忠房被切首事」との記述がある。