Sigurd was in the fortunate position that on his accession to the earldom there seem to have been no other serious contenders. In this respect his rule was unlike that of the earlier generation of the sons of Earl Thorfinn and of the next generation in that it avoided the bitter feuding that beset the earldom during both of those periods. The
Burray hoard of silver ring-money has been dated to the period 997–1010, during Earl Sigurd's reign.
Mainland Scotland (AM 132 folio 13r) circa 1350 Sigurd's domain included not just Orkney itself but also
Shetland, which formed part of the earldom and also extensive lands on mainland Scotland. For the latter his overlords were the
Kings of Scotland rather than of Norway. The extent of these mainland dominions is uncertain. According to the rather dubious source, ''
Njal's Saga'', they included
Ross,
Moray,
Sutherland and the Dales. At the time Moray would have included districts on the west coast including
Lochaber. During Sigurd's tenure the earldom approached its high point and his influence was perhaps only exceeded by that of his son
Thorfinn. and Sigurd soon faced trouble from his southern neighbours. According to the
Orkneyinga saga "Earl Finnleik" (
Findláech of Moray) led an army against him which outnumbered Sigurd's forces by seven to one. The saga then records Sigurd's mother's reply when he went to her for advice: The
Raven banner worked just as Sigurd's mother said: he was victorious but three standard-bearers in succession were killed.
The Hebrides dates from about 800 AD, and would have been a landmark when Earl Sigurd ruled the
Hebrides. Sigurd the Stout also took control of the
Hebrides, and placed a
jarl called
Gilli in charge. ''
Njal's Saga'' records an expedition that took place c. 980 in which Kari, Sigurd's bodyguard, plundered the Hebrides,
Kintyre and "Bretland" (probably
Strathclyde). On another occasion Kari sailed through
The Minch in order to collect tribute from Gilli, whose base may have been either
Colonsay or
Coll. ''Njal's Saga
records a victory for Sigurd over Gofraid mac Arailt, King of the Isles with the former returning to Orkney with the spoils. The contemporary Annals of Ulster
record a similar event in 987 although with the reverse outcome. Here it is claimed that 1,000 Norsemen were killed, among them the Danes who had plundered Iona. Two years later Njal's Saga'' reports a second campaign in the southern Hebrides,
Anglesey, Kintyre, Wales and a more decisive victory in Man. Irish sources report only the death of King Gofraid in Dál Riata, an event that Thomson (2008) ascribes to Earl Gilli's
Gall-Ghàidheil forces. By 1004 the western isles' independence from Orkney had been re-asserted under
Ragnal mac Gofraid, who died in that year. It is possible the rules overlapped, with Gilli's zone of influence to the north and Ragnal's to the south. On Ragnal's death Sigurd re-asserted control, which he held until his own death a decade later
Religion of Norway, who is said to have forcibly Christianised Orkney. This tale is repeated in ''St Olaf's Saga'', (although here Olaf lands at
South Ronaldsay) as is a brief mention of Sigurd's son "Hunde or Whelp" who was taken as a hostage to Norway by King Olaf. Hunde was held there for several years before dying there. "After his death Earl Sigurd showed no obedience or fealty to King Olaf." ==Death and succession==