Mael Isa Mac Mael Coluim

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Mael Isa Mac Mael Coluim (died Good Friday, 1136) was described upon his death on 27 March 1136 as "chief keeper of the calendar of Ard-Macha, its chief antiquary and librarian".{{cite web|url=http://www.ucc.ie/celt/published/T100005B/ |title=Annals of the Four Masters |publisher=Ucc.ie |date= |accessdate=2012-08-14}} By the 19th century the surname appears to have been rendered as McCollum.{{cite web|url=http://www.irishtimes.com/ancestor/surname/index.cfm?fuseaction=Go.&Surname=McCollum&UserID= |title=Irish Ancestors/ Surnames |publisher=Irishtimes.com |date= |accessdate=2012-08-14}}

The Abbot of Armagh at this time was Niall mac Áeda meic Máel Ísu, a member of the Clann Sinaig, while the Archbishop of Armagh was Máel Máedóc Ua Morgair.{{fact|date=November 2020}}