Prince Kitashirakawa Yoshihisa
During the Boshin War, Prince Yoshihisa fled north with Tokugawa supporters after the Satsuma-Chōshū takeover of Edo. He became the nominal head of the "Northern Alliance" consisting of most of the domains of northern Japan, led by Date Yoshikuni of Sendai. Some documents refer to Prince Yoshihisa as "'Emperor Tōbu"' and describe the planned era names for his reign, but historians disagree on whether or not he was actually named emperor. His era name was believed to have been either Taisei or Enju depending on the source.