Thorfinn Sigurdsson (1009?–c. 1065) called Thorfinn the Mighty was an 11th-century Earl of Orkney. He was one of five brothers (with Brusi Sumarlidi Einar and Hvelp) sons of Earl Sigurd Hlodvirsson. Thorfinn was the youngest of the five known sons but the only son of Sigurd’s marriage to a daughter of Máel Coluim II of Scotland.
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