The following apparent errors have been corrected:

• p. 3 "circa," changed to "circa"
• p. 12 "slaugher" changed to "slaughter"

The following are inconsistently used in the text:

• Atholl and Athole
• IngibiÖrg and IngibjÖrg
• seaboard and sea-board
• sir and Sir
• slembidjÁkn and slembi-djÁkn
• Svein and Sveinn
• uppkvÖÐ and upp-kvÖÐ