Died 1638 | ||
Terence O'Dempsey, 1st Viscount Clanmalier (died 1638) was an Irish aristocrat.
He was the son of Dermot O'Dempsey of Queen's County, part of the Dempsey sept. The family were confirmed in their lands as part of the surrender and regrant policy. Terence O'Dempsey served as sheriff of Queen's County, and was knighted in 1599, In 1631 he was made a Viscount in the Irish peerage. He was married three times, to Mary FitzGerald, Genet Finglass and Margaret Whitly.
His eldest son Owny O'Dempsey predeceased him, and he was succeeded by his grandson Lewis O'Dempsey, 2nd Viscount Clanmalier, who was attainted for his role in the Irish Rebellion of 1641 but later had his title and some of his estates restored following the Restoration.
His daughter Eleanor married Peter Sarsfield of Tully Castle in County Kildare, part of a wealthy Old English family. She was the grandmother of Patrick Sarsfield, the Jacobite general during the Williamite War in Ireland.
Another daughter Joan, married Felim O'Neill of the Clandeboye O'Neill family.