AGI  (formerly APGI) reached a milestone in its history with the organisation receiving its Grant of Arms from the Chief Herald of Ireland, Fergus Gillespie on 26 September 2006.

The Coat of Arms depicts the learned study of Irish genealogy with an open book resting on an Irish oak tree. The design is simple, with no crest or supporters, just a shield and a Latin motto. The motto, Petere Fontem, “To Seek the Source” was suggested by Eileen O’Byrne, a Fellow of AGI. In addition there is a badge which may be worn by members. It depicts the cupola of the Bedford Tower in Dublin Castle, long time home of Ulsters Office/the Genealogical Office, the font of professional genealogy in Ireland.