Certificate of ownership refers to the letter in which lords such as shogun, provincial military governor and feudal lord gave vassal samurais a guarantee for the ownership of a territory and enfeoffment from the Kamakura period onwards.
安堵状（あんどじょう）は、鎌倉時代以降、征夷大将軍、守護、大名などの主君が家臣の武士に対して、所領・知行の所有を保証した書状。