When Yoritomo's visit to his favorite mistress called Kame no mae during Masako's pregnancy was exposed, Masako became furious and ordered Munechika MAKI to destroy the residence of Kame no mae.
政子の妊娠中に頼朝がひそかに愛妾・亀の前のもとへ通っていたことが発覚し、激怒した政子が牧宗親に命じて亀の前の屋敷を打ち壊した。