This name is composed of the elements “muir” (sea) plus “cath” (battle)," hence "sea-warrior, mariner”. This was the name of several legendary and historical kings of Ireland, popular in Scotland and Ireland in the middle Ages. The personal name was introduced into Yorkshire before the Norman Conquest of 1066 by Norwegians from Ireland, and is recorded in the Domesday Book of 1086 as "Murdac, Murdoc" and "Meurdoch". Muireadhach I (also written as Murethach, Murdoch or Maurice) is the second known Mormaer of Menteith. Muiredach's High Cross is a high cross from the 10th or possibly 9th century, located at the ruined monastic site of Monasterboice, County Louth, Ireland.