Marcus Trevor, 1st Viscount Dungannon

Marcus Trevor, 1st Viscount Dungannon (1618 – 3 January 1669/70), also known as Colonel Mark Trevor, was an Anglo-Irish soldier and peer. During the English Civil War and the Interregnum he switched sides several times between the Royalist and Parliamentary forces. Under King Charles II he was a significant force in Ulster and in 1662 was created the first Viscount Dungannon.

Trevor was the son of Sir Edward Trevor of Rostrevor, County Down, and of Brynkinalt Hall, near Chirk in Denbighshire, by his marriage to Rose Ussher, a daughter of Henry Ussher (ca. 1550–1613), Archbishop of Armagh. He was thus a cousin of a later Archbishop, James Ussher (1581–1656). Thanks to the Irish Rebellion of 1641, Trevor's father was imprisoned in Narrowater Castle, where he remained until 1642 and died soon after being released. In the mean time, Trevor himself, although young, served as one of the king's commanders in County Down. In October 1641 the rebel Con Magennis addressed a letter to Trevor and others.

Following the outbreak of the First English Civil War, late in 1643 Trevor was part of a Royalist force which sailed to England, probably a division sent by the Marquess of Ormonde under Colonel Robert Byron, who garrisoned Chester. On 12 January 1644 he was almost captured by parliamentarian forces led by Colonel Thomas Mytton at Ellesmere. Trevor was soon given command of a regiment of horse, and in July fought at the Battle of Marston Moor, at which he was later claimed to have wounded Oliver Cromwell himself. Trevor's forces next marched into the north-western counties, and in October 1644 he led the defense of Ruthin. The following winter he spent in Cornwall under Ralph Hopton, and on 16 February 1646 Trevor was one of Hopton's officers at the rout of the Battle of Torrington, after which the king's army in the West was broken.

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