That said, the first Japan-wide military rule by a military family was in fact set up by Yoritomo with the Kamakura bakufu following the assassination of Sanetomo and after that even though it could be said that Yoritomo was a distant relative (great grandchild), he was invited to establish a system of shogun regents by FUJIWARA no Yoritsune; a fourth generation oldest son lineage from the Fujiwara family line of regents.
とはいいながら、実際には頼朝により初の全国的な武家政権として発足した鎌倉幕府において実朝が暗殺されて以降、頼朝の遠縁（妹の曾孫）とはいえ藤原氏の嫡流である摂家より4代将軍として藤原頼経が招かれ摂家将軍が成立した。