Also, Arimichi adopted the third son Arimitsu YAMAGATA born between Matsuko, Aritomo's daughter, and Mitsunojo FUNAKOSHI, and was baronized as a branch of the House of Yamagata.
また、有朋の娘・松子と船越光之丞の三男山縣有光を養子に迎え、山縣家分家として男爵を授爵された。