Tenshu is pointed to as one of the features of Shokuho period fortresses, because Tenshu were seen in great number in 'Shokuho period fortresses' developed under the Shokuho government of Nobunaga ODA and Hideyoshi TOYOTOMI ("Shoku" and "ho" are the initial letters of Oda and Toyotomi).
このように、天守は織田信長、豊臣秀吉の織豊政権下に置いて発達した「織豊系城郭」に顕著に見られることから織豊系城郭の特徴のひとつにあげられる。