In 1183, in the face of a fierce attack by MINAMOTO no Yoshinaka, the Taira Clan decided to flee Kyoto and since Tomotada was still an infant, his father ordered that he be placed in the care of his wet nurse's son, Tamenori TACHIBANA, in Iga Province.
寿永2年（1183年）、源義仲の攻勢の前に平家が都落ちを決意した時、知忠は幼少のために父の命令で伊賀国にいる乳母子の橘為教のもとへ預けられた。