Barry, David Fitz-David (1605–42), 1st earl of Barrymore , nobleman, was born on or slightly before 10 March 1605, the posthumous son of David Barry; his mother, Elizabeth, was the daughter of Richard, Lord le Power, and his wife, Catherine. As heir to his grandfather David Fitz-James Barry (qv), Viscount Buttevant (d. 1617), and great-uncle Richard Barry (d. 1622) he inherited the viscountcy and extensive, but heavily mortgaged, estates in Co. Cork, later confirmed to him by both James I and Charles I. He was raised a protestant, and may have attended Eton for two years. Richard Boyle, 1st earl of Cork (qv) had begun to buy up mortgages on Barry's estates by 1617 and in July 1621 Barry married Alice Boyle, eldest daughter of the earl and his wife, Catherine Boyle (qv). Cork continued to lend money to Barry and his wife, secured on the Barry estates, financed the rebuilding of Barry's residence at Castlelyons, Co. Cork, and spent £3,000 in securing for him the title earl of Barrymore to which he was named 30 November 1627 (patent 28 February 1628).
In 1639 Barrymore raised an Irish regiment for service in the first bishops’ war, though it arrived too late to take part in campaigning; he served in England as a colonel again in 1640. He spurned offers to join the insurgents in 1641, instead raising and commanding troops against them in co-operation with his Boyle kin. Along with Lord Inchiquin (qv), he was appointed a commissioner for the civil government of Munster, probably in July 1642. He died 29 September 1642, apparently from wounds received in battle at Liscarroll, and was buried in the Boyle family vault at Youghal. He left two sons and two daughters.