Who held the head of the fjord
Ornes was a Viking-age power centre with a great ship burial mound. Bolstad farm holds Viking-age finds dated 800–1000 AD. A rich woman's grave found in Luster is read as that of a völva — a Norse seeress.
That is not a raider's camp. It is an organised society commanding the head of the fjord and the passes behind it.
Melting ice patches on the passes above the fjord have given up horse tack and arrows from the Viking age — the mountain routes to the inland ran over Sognefjellet, and Skjolden was where they met the sea.
The long-fibred pine of the Urnes–Kinsedal shore was prized mast timber. A link between Luster timber and the Skjoldungen ship found at Roskilde has been proposed — it remains an open research question, and the port states it as exactly that.