Genki (元亀) was a Japanese era name (年号, nengō, "year name") after Eiroku and before Tenshō. This period spanned from April 1570 through July 1573.[1] The reigning emperor was Ōgimachi-tennō (正親町天皇).[2]
Genki gannen (元亀元年); 1570: The era name was changed because of various wars. The previous era ended and a new one commenced in Eiroku 13, on the 23rd day of the 4th month.
1571 (Genki 2, 9th month): Nobunaga marched into Ōmi Province at the head of his army which surrounded Mt. Hiei. He massacred the priests and everyone else associated with the mountain temples; and then he gave orders that every structure on the mountain should be burned.[4]