Chapter Iii.--the Early Norse Jarls

790-1014--Constantine I and the Northmen--Kenneth and the Union of the Picts and Scots--Thorstein the Red and Aud--Groa and Duncan of Duncansby--The Vikings and Harald Harfagr--Ragnvald of Maeri and Jarl Sigurd--Cyderhall--Torf-Einar, Thorfinn Hausakliufr, Skuli and others--War for the Moray seaboard--Jarl Sigurd Hlodverson-- Christianity introduced in Orkney--Swart Kell--Earl Anlaf--Story of Barth--Sigurd Hlodverson, Clontarf--"Darratha-liod"--Resumé.