The name, Yamagata, has already existed in one of the oldest Japanese family registry which was published in 702 and has been stored in Shosoin, Nara.
Despite this, he was not arrested for lèse majesté, even when donning the Imperial Crest, because he had a koseki detailing his bloodline back to Go-Daigo in Yoshino, but has been unsuccessful at creating any political change other than sympathy.