"A Stór Mo Chroí" is Irish and means approximately "darling of my heart."
Brian O'Higgins was an Irish patriot who took part in the 1916 Rising and was an active Republican for the rest of his life. He published a yearly newsletter called the Wolfe Tone Annual that served as a counterblast to the views propagated by the ‘revisionist’ official historians in Ireland.
He wrote a large number of patriotic songs and poems, many under the pen name of Brian na Banban. Most of his works were written in response to specific events, so they have tended to become lost to dusty tomes as memory of the events faded and they lost their significance. Now when they are sung, they usually require an explanation of the events on which they were based.