Note 522 — Chapter VII · THE KINGDOM OF ALBAN.
Reading edition
A.D. 966. And in the same year Oslac obtained an aldordom.—Sax. Chron. Deinde sub Eadgaro rege Oslac præficitur Comes Eboraco et locis ei pertinentibus; et Eadulf, cognomento Yvelchild, a Teisa usque Myrcforth præponitur Northymbris.—Libellus de adventu, Sax. Ch. p. 212.
This word Myrcforth is in one MS. Myreforth, which reading has been usually adopted, but the former is the correct form of the name. The Firth of Forth is called in the Norse Sagas Myrkvafiord or the mirk or dark firth, and Myrcford is the Saxon equivalent.