Kinzan

…He first studied waka poetry under Konoe Motohisa and Karasuma Mitsuhiro, and eventually specialized in appraising old calligraphy. It is said that he was summoned by Toyotomi Hidetsugu and was given the golden seal of “Kotoyama” and the surname of “Kotoyama”. Since then, the family has continued to prosper as the head of the old calligraphy family, using “Kotoyama” as their seal and providing appraisal services, up until the modern era. …

*Some of the terminology that refers to "Kotoyama" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…彼は初め近衛前久，烏丸光広らに和歌などの教えをうけ，やがて古筆鑑定を専業とするに至る。また，豊臣秀次に召されて，〈琴山〉の金印を賜り古筆の姓をうけたと伝える。以後代々〈琴山〉を極印（きわめいん）とし鑑定を業とする古筆の宗家として栄え近代に及んだ。…

※「琴山」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報