Miyoshi clan
The Hatano clan had, from the time of Hideharu's grandfather Hatano Tanemichi, been retainers to the powerful Miyoshi clan and its leader Miyoshi Nagayoshi. Following tradition Hideharu had been the Miyoshi's retainer as well. The reason that such a minor clan as his had attended the Emperor Ōgimachi's coronation is believed to be due to the influence of Nagayoshi.