The marriage produced two sons: In 1307, Sir Edmund and Joan's father dispersed rebels in Offaly who had burnt the town of Leix and destroyed the castle of Geashill.
That same year, in July, Joan's husband and her father led the Munster and Leinster contingent of armed forces who were allied with the combined armies of Richard de Burgh, 2nd Earl of Ulster and Felim mac Aedh Ua Conchobair, King of Connacht against the Scottish and Irish troops of Edward Bruce who had been crowned King Of Ireland at Carrickfergus.
However, the charter, while creating an Earldom, failed to make Edmund Butler's issue Earls of Carrick.
[1] Joan's father, John FitzThomas FitzGerald, died a year later on 10 September 1316, several months after being created Earl of Kildare by King Edward II.
She was the ancestress of the earls of Ormond, the queen consort Anne Boleyn and Diana, Princess of Wales.