The defeat of the Normans allowed for the return of the exiled Gruffudd ap Cynan, King of Gwynedd, who thereby regained control of his former lands.

[1] After he had subdued most of the Isles and set up his base on Mann, he went further south and appeared with six ships (according to the English chronicler Orderic Vitalis),[1] off the coast of Anglesey, only a few days after the Norman capture.

[2] According to Orderic Vitalis, Magnus entered the Menai Strait with a red shield on the mast, which was the usual sign to signal peace and trade.

[3] The fighting started with the two sides shooting arrows at each other, the Norwegians while still on board their ships, and the Normans while standing on the shore.

[9] Since the Norwegians never settled on the island, Anglesey reverted to Welsh control[6] when Gruffudd ap Cynan returned from Ireland in 1099.