Ásvaldur Úlfsson

http://en.wikipedia.org/wiki/%C3%9Eorvaldr_%C3%81svaldsson

Thorvald Asvaldsson (Old Norse: Þórvaldr Ásvaldsson) was the father of the colonizer of Greenland, Erik the Red, and grandfather of Leif Ericson, who visited North America centuries before Christopher Columbus. Thorvald's father was Ásvald Ulfsson, whose father was Ulf Oxen-Thorisson, whose father was Oxen-Thorir, brother of Naddodd, discoverer of Iceland.

Thorvald Ásvaldsson was born in Norway. He was exiled from Norway c. 960, during the reign of King Harald Fairhair, for the crime manslaughter. He left with his son Erik to northwest Iceland, where he died before 980.

translated from https://no.wikipedia.org/wiki/Thorvald_%C3%85svaldsson

According to Eirik Raude's saga Thorvald Åsvaldsson's father was Ásvald Úlfsson, son of Ulf, the son of ØKSNES-Tore (Oxna-Thorir), brother of Naddodd, the Norwegian Viking from Agder who according to Landnåmaboka discovered Iceland in the 800s.