Handsome Lake (Cayuga language: Sganyadái:yoˀ, Seneca language: Sganyodaiyoˀ) (Θkanyatararí•yau•[1] in Tuscarora) (1735 – 10 August 1815) was a Seneca religious leader of the Iroquois people. He was a half-brother to Cornplanter, a Seneca war chief.[2]
Handsome Lake, a great leader and prophet, played a major role in reviving traditional religion among the Haudenosaunee (People of the Longhouse), or Six Nations Iroquois Confederacy. He preached a message that combined traditional Haudenosaunee religious beliefs with a revised code meant to revive traditional consciousness to the Haudenosaunee after a long period of cultural disintegration following colonization. This message was eventually published as the "Code of Handsome Lake" and is still practiced today.