This page categorizes the "Great Clans" that the modern-day Clan cat's myths are based on. Cats from all four Clans are said to be descended from these three ancient Clans.
“TigerClan was one of the three great Clans, along with LionClan and LeopardClan, that resided in...TigerClan (Mythological)
“LeopardClan is one of the ancient Clans, along with LionClan and TigerClan. It consisted of...LeopardClan