Matudán mac Muiredaig (died 857) was a Dál Fiatach king of Ulaid, which is now Ulster, Ireland.
[2] Vikings were on Lough Neagh in 839 and wintered there in 840-841 in the opening years raiding the various parts of the north including the Ulaid territories.
[3] In 852 the Norse fought a fierce naval battle with newcomers, the Danes, in Carlingford Lough but were heavily defeated.
[4] In 851 Matudán met with the high king Máel Sechnaill mac Máele Ruanaid (died 863) of the southern Uí Néill in Armagh.
In a meeting presided over by the clerics of Armagh and Mide, Matudán formally acknowledged the authority of the high king.