The Imakoji family, the house where Mansai was born, descended from Yoshifuyu NIJO (a son of Kanpaku Kanemoto NIJO (chief advisor to the Emperor)) and Mansai was the 4th generation grandchild of Kanemoto.
生家の今小路家は関白二条兼基の子二条良冬を始祖とし、満済は兼基の四世孫にあたる。