But perhaps no figure stands out so prominently in the Irish and Norse chronicles[70] of the second half of the tenth century as Gormflaith (O.N. Kormlöth) who first married Olaf Cuaran, then his enemy Maelsechnaill II., and finally Brian Borumha, from whom she also separated. The interchange of family and personal names which took place to such an extent during the Viking period also points to the close connection between the foreigners and the Irish. As early as 835 mention is made of one Gofraidh (O.N. Guthröthr), son of Fergus, who went to Scotland from Ireland in order to strengthen the Dal Riada and died some time after as King of the Hebrides.[71] The Dublin Viking who led an attack on Armagh in 895 had an Irish name, Glun-iarainn, obviously a translation of O.N. _Jarn-kné_. He was in all probability a relative of Iercne or Jargna (corrupt forms of _Jarn-kné_) who ruled in conjunction with Zain or Stain (O.N. Steinn) as King of Dublin (c. 850);[72] while other earls of Dublin, Otir mac Eirgni,[73] Eloir mac Ergni or Largni[74] and Gluntradna, son of Glun-Iarainn would also appear to have been of the same royal family.[75] Irish names occur more frequently in Norse families during the tenth and eleventh centuries; we find Uathmaran, son of Earl Bairith (O.N. Barthr); Camman,[76] son of Olaf Godfreyson; Giolla Padraig, Dubhcenn[77] and Donndubhan, sons of King Ivarr of Limerick;[78] Niall, son of Erulb (O.N. Herjulfr); Cuallaidh, son of King Ivarr of Waterford; Eachmarach, and very many others.[79] On the other hand, we may note the prevalence of such common Norse names as Ivarr, Guthröthr, Sumarlithi among the Irish, especially in the eleventh and twelfth centuries. Several of these names still survive, as, for instance, MacAuliffe (O.N. Óláfr); MacCaffrey (O.N. Guthöthr); MacCalmont or Lamont (O.N. Lögmathr); Kettle (O.N. Ketill); Kitterick (? Ir. Mac + N. Sigtryggr); MacKeever (O.N. Ivarr); Manus and MacManus (O.N. Magnus); Quistan (Ir. Mac. + O.N. Eysteinn); Reynolds (O.N. Rögnvaldr); Sigerson (O.N. Sigurthr) and MacSorley (O.N. Sumarlithi). Both Gaill and Gaedhil, so dissimilar in many ways, benefited by their intercourse with one another. In Ireland the Vikings played an important part in the development of trade; they also promoted the growth of town life. We may trace the beginnings of the seaport towns, Dublin, Limerick, Waterford and Wexford, to the forts built by them near the large harbours in the ninth and tenth centuries. In Dublin coins were minted for the first time in Ireland[80] during the reign of Sihtric Silken Beard (c. 989-1042). Moreover, the large number of loan-words from Old Norse which made their way into Irish shows that the Irish learned in many other ways from the invaders, notably in shipbuilding and navigation.