Of the Moddan line the Saga says[7]—"These men were all of great family and great for their own sakes, and they all thought they had a great claim in the Orkneys to those realms which their kinsman Earl Harald (Slettmali) had owned. The brothers of Frakark were Angus of the open hand, and Earl Ottir in Thurso: he was a man of birth and rank." These children of Moddan were probably of royal lineage or kinship, as Moddan, who had been created Earl of Caithness by King Duncan I, was that king's sister's son, and was probably, as we have seen, their ancestor or kinsman. They were also probably descended more remotely from Moldan, Maormor of Duncansby, a kinsman of Malcolm II, but had all been driven back from the coast, save Earl Ottir, who lived at Thurso, and probably owned its valley up to its source in the Halkirk and Latheron hills.

The death of Harald the Glib by poison left Paul de facto sole jarl of Orkney. We are told[8] that "Paul was a man of very many friends, and no speaker at Things or meetings. He let many other men rule the land with him, was courteous and kind to all the land-folk, liberal of money, and he spared nothing to his friends. He was not fond of war, and sate much in quiet." We may be sure that he was little, if ever, in Sutherland, the country of his enemy Frakark. His rule was, however, destined to be disturbed, on the one hand by the Moddan family's plots, and, on the other hand, by a Norse competitor for the jarldom, Kali, son of Kol and Gunnhild, Jarl St. Magnus' sister, who had been re-named Ragnvald from his resemblance to the handsome Jarl Ragnvald Brusi's son, and was afterwards designated Jarl of Orkney by King Sigurd of Norway, as the representative of the line of Erlend, Thorfinn's son.

With Jarl Ragnvald, Jarl St. Magnus' sequel in estate, and himself afterwards St. Ragnvald, who was much in Caithness and Sutherland, and seems to have held and acquired considerable estates there, begins what is practically a new Saga, which may be styled "The Story of Ragnvald, and of Sweyn" the great Viking. Of these two we have perhaps the finest and most vividly painted pictures of the Orkneyinga Saga, full of dramatic touches, full, too, of interesting historical detail.

First, we have a portrait of the young Ragnvald as Kali Kolson in his youth at Agdir in Norway, with his mother Gunnhild, sister of Jarl St. Magnus Erlend's son, and his shrewd old father Kol. We are told that Kali was "the most hopeful man" or man of promise, "of middle stature, fine of limb, with light brown hair"; how he "had many friends, and was a more proper man both in body and mind than most of the other men of his time, a good player at draughts, a facile writer of runes, and a reader of books, good at smith's work, ski-ing, shooting, and rowing, and as skilful at song as at the harp."[9]

At the age of fifteen, he traded to Grimsby, where many Norwegians and Orkneymen came, and many from the Hebrides; and here he met Harald Gillikrist, who became his firm friend, and confided in him alone that he, Harald, was the son of King Magnus Barelegs, asking how he would be received by King Sigurd of Norway, and obtaining the diplomatic reply that he would be well received by the king, if others did not spoil his welcome. Then Kali returns to Bergen in 1116, about the time of Jarl Magnus' murder by his cousin Jarl Hakon, and after a friendship and a feud with Jon Peterson, which is amicably settled by the marriage of Jon with Kali's sister Ingirid, and of which the description well illustrates the manners and law of the times, is made Jarl Ragnvald of Orkney by King Sigurd; and on that king's death in 1126 he is confirmed in the title by his friend King Harald, for whom he fought in the battle for the throne at Floruvoe near Bergen, when King Magnus was captured, maimed, and deposed by Harald in 1135.

Jarl Paul, however, refused to part with half the isles; and, acting on Kol's advice, Jarl Ragnvald's messengers apply for aid in obtaining it to Frakark and her grandson Olvir Rosta in Kildonan, and offer them Paul's half share if they will help Ragnvald to secure his half. Frakark, having previously arranged that her niece Margret, the daughter of Earl Hakon and Helga, should marry Earl Maddad of Athole, second cousin to David I, as his second wife, thought that Orkney might be had, with half the jarldom and all Caithness, for Margret's son Harold Maddadson, then an infant in arms.

Ragnvald and Frakark then made common cause.[10] But in 1136 Paul defeated Frakark's ships in a sea fight off Tankerness in Deer Sound in Orkney, and immediately afterwards seized Jarl Ragnvald's fleet in Yell Sound in Shetland, though Ragnvald and his men escaped to Norway in merchant vessels, to return later on.[11]

Meantime Olvir Rosta, Frakark's grandson, who had been stunned and nearly drowned in the sea fight at Tankerness, in which Sweyn's and Gunni's father, Olaf Hrolf's son, had aided Jarl Paul, burned Olaf alive in his home at Duncansby, Asleif, Olaf's wife, escaping only because she was absent at the time. Further, Valthiof, Sweyn's elder brother, was drowned in the roost of the West-firth, while rowing south to Jarl Paul's Yule Feast. Sweyn Asleifarson, as he was ever afterwards called, then went to Paul's Hall at Orphir to complain of Olvir Rosta. The news of his brother's death, which arrived during the feast, was considerately withheld from him, and he was greatly honoured there; but he roused the jarl's anger by slaying Sweyn Breast-rope, the jarl's forecastle-man, at Orphir, not indeed so much for the murder, as because Sweyn had fled and did not come to submit himself after it to the jarl, and so offended him.[12]

Then follow the stories, well worth reading in the Saga itself, of the raising and lowering of the sails on Ragnvald's ships and of the mutiny of Paul's followers, and of the dowsing of the beacons on the Fair Isle by Uni, Ragnvald's ally, of Ragnvald's landing in Westray, of his suppression of all opposition to him, of the spies at Paul's Thing, of Sweyn's junction of forces with Ragnvald, of Sweyn's visit to Margret at Athole, and his dramatic kidnapping of Jarl Paul while hunting otters near Westness[13] in the Isle of Rousay, in Orkney, and of the jarl's deportation by Sweyn first to Dufeyra and thence via Ekkjals-bakki[14] to Athole to his sister Margret, who receives him with the utmost show of cordiality, and finally of Paul's abdication in favour of Margret's second son, Harold Maddadson, then a boy of five years of age, with the instructions to Sweyn to tell the Orkneymen that Paul himself was blinded, or, worse still, maimed, so that his friends should not seek him out, and restore him to his jarldom.[15] Such is one version of the story; the other is a more sinister tale, that his half-sister Margret cast Jarl Paul into a dungeon and had him murdered, and, so far as the Saga relates, he left no issue.

Sweyn then returns to Orkney and tells his version of the affair to the bishop, the bishop to Ragnvald, and Ragnvald to the "good men" or lendirmen of Orkney, who express themselves satisfied, and Ragnvald builds the Cathedral he had vowed to St. Magnus in Kirkwall—a strange medley of craftiness, murder, and piety.