Byron first served as High Sheriff of Nottinghamshire for 1634 and then as Lieutenant of the Tower of London, from Dec. 1641 to Feb. 1642. When the Civil War started he joined the King at York. He was engaged on the Royalists' cause throughout the Civil Wars and afterwards. After Byron distinguished himself at the First Battle of Newbury King Charles created him Baron Byron in October 1643 and made him commander of the Royalist forces in Lancashire and Cheshire. Lord Byron died in 1652, childless, in exile in Paris, and was succeeded by his next eldest brother Richard Byron (born 1606).