Dillon married twice. His first wife was Elizabeth Barnewall, only daughter of Thomas Barnewall of Irishtown, who was the second son of
Robert Barnewall, 1st Baron Trimleston. Bartholomew and Elizabeth had a son: • Thomas (living in 1541), married Anne, daughter of Sir
Thomas Luttrell, and was father of Sir
Robert Dillon —and two daughters: • Anne, married Nicholas Kent of Davidstown • Ismay, married three times. First to John Fleming of Stephenstown, a grandson of
James Fleming, 7th Baron Slane, and was the mother of
Thomas Fleming, 10th Baron Slane. Secondly to Richard Tath of Cookstown, and thirdly to Sir Thomas Barnewall, second son of
John Barnewall, 3rd Baron Trimlestown and his eldest child by his second wife Margaret FitzLeones. Dillon's younger brother
Robert founded the branch of the family that would later hold the title
Earl of Roscommon. By birth and marriage the Dillon brothers belonged to the small
Anglo-Irish ruling class of
the Pale. == Career ==