The Koga Clan was a prominent group of ninja in Japan during the feudal era, particularly active in the 16th century. They were based in the Koga region of Shiga Prefecture and were known for their skills in espionage, guerrilla warfare, and various martial arts. The clan often engaged in conflicts with the rival Iga Clan, which was another famous group of ninja. Members of the Koga Clan were trained in various techniques, including stealth, sabotage, and assassination. They played significant roles in the political intrigues of the time, often serving powerful feudal lords. The legacy of the Koga Clan continues to influence popular culture, particularly in movies and literature about ninjas.