Note 80 — Chapter II · INTERCOURSE BETWEEN THE GAILL AND THE GAEDHIL DURING THE VIKING PERIOD.
Reading edition
From the contemporary Irish poems the Book of Rights and The Curcuit of Muirchertach Mac Neill it may be inferred that in ancient Ireland all payments were made in kind. With the extension of trade, however, it is probable that many Anglo-Saxon and other foreign coins—including those of the Scandinavian Kings of Northumbria, several of whom also reigned in Ireland—came to be circulated in Ireland. The Vikings in England struck coins there during the reign of Halfdanr (d. 877). (Cf. C. F. Keary: Catalogue of Coins in the British Museum, I., p. 202).