sentences:  The word was first used in the 840s in the Irish account of The Annals of Ulster and in the Frankish account in the Annals of St. Bertin with the establishment of Viking encampments at Linn Duachaill and Dublin.It also describes new Viking settlements established at Waterford in 914 and Limerick in 922 possibly by the Uí Ímair.Many camps along river banks and lakes did not last long, however, some only as little as one or two seasons, but others such as Dublin developed into large urban centers, as did the other significant Norse settlements at Cork, Waterford, Wexford and Limerick which remain the largest urban centers in Ireland today.