Talk:Aizen Kunitoshi/@comment-26019974-20150324204752/@comment-1883159-20150328115403

It could either refer to any of the swords that Rai Kuniyuki made, or to Kuniyuki himself.

Kuniyuki had two sons, the first one is Aizen's swordsmith while the second one is Hotarumaru's. You're right about the tachi part, in that Kuniyuki more often make tachi than tantou. One of the famous tachi that he made and is considered as a national treasure is Akashi Kuniyuki.

... or, that's what I could understand from this site. Maybe someone else could check it out and see if I read it right, now too knowledgeable about sword-related terms...