Viscount Barnewall, of Kingsland in the Parish of Donabate in the County of Dublin, was a title in the Peerage of Ireland. It was created on 29 June 1646 for Nicholas Barnewall, who had earlier represented County Dublin in the Irish House of Commons. The Kingsland Barnewalls were a junior branch of the family of Baron Trimleston; Nicholas's great-grandfather Sir Patrick Barnewall had achieved political prominence through his friendship with Thomas Cromwell and done well out of the Dissolution of the Monasteries . Nicholas was made Baron Turvey at the same time, also in the Peerage of Ireland. His grandson, the third Viscount, was a supporter of James II and outlawed. However, he was restored under the Treaty of Limerick. His son, the fourth Viscount, was a Roman Catholic and consequently d