Under the diminishing authority of the Rokkaku clan, Rokkakushi Shikimoku was established after Sadahide GAMO and other major vassals drafted the shikimoku (law codes in the itemized form, which were used in the medieval Japan) and Yoshikata ROKKAKU and Yoshisuke ROKKAKU, father and son, approved it.
六角氏の権威が弱まる中で、蒲生定秀ら有力家臣が式目を起草し、六角義賢・六角義弼父子が承認することで成立した。