Hiallt

Hiallt (also Hialt and Healthene) was a norseman active around the year 920. He is credited with founding the village of Hauteville (same as Hauteville-la-Guichard?), in Latin Hialtus Villa, in the Contentin region of Normandy. The name “Hiallt” might refer to the Scandinavian Hjalti, or it might simply be a legendary eponymous: Hauteville (Altavilla) simply means "high estate" indeed.

Ancestors
According to the genealogy charts in “The British Chronicles” by David Hughes, Hiallt descended from the legendary figures of Holgar “the Dane” and Estrid, daughter of King Gudfred of Denmark.

Descendants
Hiallt is considered an ancestor of Tancred of Hauteville, and thus the founder of the House of Hauteville, which bears his name. This cannot be verified with certainty. Tancred's sons later led the Norman Invasion of southern Italy and they and their descendants ruled powerful states in the Mediterranean region, like the Duchy of Apulia and the Kingdom of Sicily.