Co-founder of the Haudenosaunee Confederacy (Iroquois Six Nations: Mohawk, Oneida, Onondaga, Cayuga, Seneca, Tuscarora — the latter joining post-c.1722); foundational figure of the Great Law of Peace (Kaianerékowa). Born variously to an Onondaga or Mohawk family per recension. Traditional dating by Iroquois oral tradition places his life c. 1142 CE (anchored to the canonical-Iroquois "sun darkening" cosmic-event identified with a verifiable solar-eclipse); academic-archaeological dating clusters around 1450 CE per Mann & Fields 1997. After the killing of his three daughters (in most recensions by the sorcerer Atatarho — the canonical-Iroquois evil-figure with snake-hair), fled into grief-and-mourning, encountering Deganawida (the Great Peacemaker — whose name is too sacred to speak in many Haudenosaunee communities, leading Hayowentha to function as the public-historical face of the foundation). Together they brought the Great Law of Peace to the original five nations, traveling across the territories and combing the snakes from Atatarho's hair to convert him to the Confederacy — the canonical "combing the snakes" narrative being one of the most-iconic Iroquois foundation-images. The Confederacy was foundationally established at the Onondaga council site, with the white pine planted as the Tree of Peace under which the weapons of war were buried. Established the wampum-belt tradition for recording the Great Law of Peace and the Condolence Cane for the foundational Iroquois condolence-ceremony. The Henry Wadsworth Longfellow poem "The Song of Hiawatha" (1855) conflated the historical-Iroquois Hayowentha with the Anishinaabe figure Nanabozho/Hiawatha, creating the widespread English-language Hiawatha-figure; the registry-entry preserves the historical-Iroquois Hayowentha distinct from the Longfellow-conflated figure.