In "Eimeiyawa," the following description is included as what Koan WATANABE talked: "The handwriting of Gongen-sama (Ieyasu) is as bad as that of persons who had no knowledge of writing."
『永茗夜話』には渡辺幸庵の話として「権現様（家康）は無筆同様の悪筆にて候」とある。