Muiredach mac Eochada (died 839) was a Dal Fiatach king of Ulaid, medieval Ireland.
[4] Viking raids included an attack on Loch Bricrenn (Loughbrickland, modern County Down) in the territory of the Uí Echach Cobo in 833.
[6] The King of Ailech Niall Caille (died 846) of the northern Ui Neill raised an army and marched on Armagh.
[9] The Annals of Innisfallen note the death of Indrechtach mac Tommaltaig of the Leth Cathail (Lecale) branch of the Dal Fiatach as co-ruler of Ulaid in 835.
His daughter Gormalaith Rapach ("the harsh") married Áed Findliath (died 879) high king of Ireland.