Thorbiorn Klerk, grandson of Frakark, 59;
tutor to earl Harold Maddadson, 63;
m. Ingirid, sister of Sweyn, 63;
his character, 63;
burned Waltheof, 65;
divorces Sweyn's sister, 66;
instigated quarrel between earls in Thurso, 69;
viking raid, 70;
ambushed earl Ragnvald, 70-71;
burnt alive, 71;