At the unveiling in 2011 of a plaque in Railway Street organised by the Dublin North Inner-City Folklore Project to commemorate those who composed, wrote and translated Amhrán na bhFiann (The Soldier’s Song) were, from left, Valerie Heeney, a descendant of composer Patrick Heeney; Peadar Bourke, a nephew of lyricist Peadar Kearney; and Helein Crowley, a daughter of translator Liam Ó Rinn. Photograph: Matt Kavanagh

Over the past few years I’ve spent researching the world’s first book on national anthems, there’s several things I’ve discovered. For a start, that a(...)