Sir Robert Stewart
Stewart, Sir Robert, was made Governor of Londonderry and Culmore by Charles I., in 1643. On 13th June of the same year he defeated Owen Roe O'Neill at Clones, taking prisoner several foreign officers who had accompanied O'Neill to Ireland. Soon afterwards he embraced the Scottish engagement against the Parliament, and in his well-fortified stronghold of Culmore, prevented access by sea to Londonderry. In 1648 he was inveigled into attending a private baptism in Londonderry, seized by Coote, and compelled to give an order for the surrender of Culmore. By direction of Monk, he was removed to London, where he lay immured in the Tower for some years. After the Restoration he was reinstated in his honours, and died Governor of Londonderry in 1661.
Sources
217a. Londonderry, Siege and History of: James Hempton. Londonderry, 1861.