Moddan, Earl of Caithness, was killed in 1040. His mother, daughter of Bethoc, must have been born after 1002. If she was married at seventeen, her son Earl Moddan could not have been more than twenty when killed in 1040, and any son of his must have been born by 1041 at latest. This son may have been Moddan in Dale. Dale was the valley of the upper Thurso River, the only great valley of Caithness, and the Saga states as follows:-- Moddan[19] "then dwelt in Dale in Caithness, a man of rank and very wealthy," and "his son Ottar was jarl in Thurso." Frakark, a daughter of Moddan in Dale, was the wife of Liot Nidingr, or the Dastard, a Sudrland chief, and during the half century after Thorfinn's death Moddan's family seems to have owned much of Caithness and Sutherland, where the Norse steadily lost their hold. We may be sure also that the Celt always kept his land, if he could, or, if he lost it, regained it as soon as he could. Amongst its members this family probably held all the hills and upper parts of the valleys of Strathnavern, Sutherland and Ness at this time, and, from a centre on the low-lying land at the head waters of the Naver, Helmsdale and Thurso rivers, kept on pressing their more Norse neighbours steadily outwards and eastwards. Shortly after Hakon's death in 1123, King Alexander I and his brother, David I, began to organise the Catholic Church in Scotland, and also to introduce feudalism. Even in the north of Scotland, between the years 1107 and 1153 they founded monasteries and bishoprics, and introduced Norman knights and barons holding land by feudal service from the Crown. Long thwarted in their policy by Moray and its Pictish maormors, who claimed even the throne itself, these two kings pushed their authority, by organisation and conquest, more and more towards the north. Alexander I founded the Bishoprics of St. Andrew's, Dunkeld, and Moray in 1107, and the Monastery of Scone, afterwards intimately connected with Kildonan in Sutherland, in 1113 or 1114. David I, that "sair sanct to the croun," who succeeded in 1124, founded the Bishoprics of Ross and of Caithness in 1128 or 1130, and of Aberdeen in 1137, and endowed them with lands. The same king[20] between 1140 and 1145 issued a mandate "to Reinwald Earl of Orkney and to the Earl and all the men of substance of Caithness and Orkney to love and maintain free from injury the monks of Durnach and their men and property," and also in some year between 1145 and 1153, he granted Hoctor Common[21] near Durnach, to Andrew, Bishop of Caithness, whose see was then well established there, and he spent the summer of 1150, while he was superintending the building of the Cistercian abbey of Kinloss, in the neighbouring Castle of Duffus, whose ruins still stand, with Freskyn de Moravia, the first known ancestor of the Earls of Sutherland.[22]