[Footnote 154: Siward married Ælflæd, daughter of Ealdred, Earl of
Bernicia in Northumbria (see p. 13).]
[Footnote 155: Nor. Hist., I, pp. 180-81.]
[Footnote 156: Macb., Introd., p. 15.]
[Footnote 157: Chron., V, p. 274.]
[Footnote 168: Quoted by Langebek in Sc. Rer. Dan., III. p. 291, n.]
[Footnote 159: Olrik; see p. 65.]
[Footnote 160: Skjs. (Aarb., pp. 110 ff.).]
[Footnote 161: Oldn. Lit. Hist., II, p. 665.]
[Footnote 162: See pp. 64 ff., where Olrik's explanation of the development in the relations between Frothi and Halfdan, from the earliest to the latest account, is given in full.]
[Footnote 163: See p. 69.]