There is no historical material related to Masako and Yoritomo at this time; however, a section in "Soga Monogatari" (Tale of Soga) called 'Yumekai' (Buying a Dream), tells about how the two met.
この頃の政子と頼朝に関する史料はないが、『曾我物語』によると二人の馴れ初めとして「夢買い」の話がある。