Reference

Torf-Einarr, also known as Einarr Rǫgnvaldsson, was a Norse Earl of Orkney who lived in the early tenth century. He ruled from around 910 to 946, succeeding Hallad Rognvaldsson and preceding Arnkel Torf-Einarsson. Torf-Einarr was the son of Ragnvald Eysteinsson of Møre, Norway, and was known for introducing turf as a fuel to the islanders, which is how he earned the nickname "Torf-Einarr". His era was the Viking Age, a period marked by the expansion of Norse peoples across Europe. For more detailed information, you can refer to the Skaldic Project.