Mac Laisre was descended from the High King of IrelandNiall of the Nine Hostages and his genealogy is- “Mac Laisre easbacc m Luighdeach m Ronain m Tuadain m Aodha m Fearghosa m Eoghain m Neil naoighiallaig. Archiepiscopus Ardmachanus, obijt 622, 12 Sep.” His paternal uncle was St. Colman Muilinn, of Derrykeighan, County Antrim. An alternative genealogy is found in some texts as follows- “Maclaisre easbacc m Conaill eachluaith m Luighdeach menn m Aonghasa tirigh m Fir cuirb m Modha cuirb m Corbmaic cais m Oilealla oluim m Modha nuadad m Modha ned”. This is unlikely to be correct for two reasons. Firstly his position in this genealogy would place him about the middle of the 5th century which is over a hundred years earlier than his birth. Secondly it would make him a Munsterman and as the local Armagh tribes at the time of his tenure had a firm grip on the right to choose the Bishop of Armagh, it is unlikely they would give the post to a person from Munster. The See at this time was always held by Ulstermen. Mac Laisre’s name has caused confusion to scholars through the centuries. At first glance it means ‘Son of Laisir’ and some writers like Colgan, Ware, Cotton and O’Hanlon assumed that Laisir was his father’s name and that Mac Laisre was an epithet and not his real name. This led them down the path of seeking an incorrect alternative identification such as the person called "Terenannus Archipontifex Hibernia" in the Life of St. Laurence, Archbishop of Canterbury. However we know from the genealogies that Mac Laisre’s father’s name was not Laisir but Luighdeach. This led others to suggest Lasar was his mother’s name and therefore Mac Laisre is a matronymic rather than a personal name. However the names of several different persons named Mac Laisre appear in the early genealogies and no alternative proper personal first name is ever found for them. This must therefore mean that Mac Laisre is neither an epithet, patronymic or matronymic but a proper personal first name. Vernam Hull was of the opinion that- ‘Mac Lasre seems to mean "Son of Flame". If so, the nominative singular of Lasre is Lasar ’.
Bishop of Armagh
On the death of Saint Senach, the Bishop of Armagh, on 11 April 610, St. Mac Laisre was appointed as the 15thcoarb in succession to Saint Patrick. Saint Mac Laisre reigned as Bishop for 13 years.
Death
St. Mac Laisre died on 12 September 623. The Annals of Ireland give the following obits-
Annals from the Book of Leinster- “Macc-Laisre, abbot of Armagh”
Feast day
After his death St. Mac Laisre was venerated as a saint and his feast was celebrated on the 12 September, the day of his death. The Calendars of the Saints have the following entries-
Martyrology of Gorman 12 September- “Mac Lasre, a bishop and abbot of Armagh”
Martyrology of Donegal 12 September - “Maclaisre, Bishop and Abbot, of Ard-Macha, A.D. 622. I think it is he that is of the race of Eoghan, son of Niall; or it may be he is of the race of Corbmac Cas, son of Oilioll Olum”
