 Complete the following phrase:  Roos was the eldest son of Robert Roos, Lord of Moor End and Anne Halsham. When his father died in 1448, Henry succeeded as Keeper of Rockingham Forests. Henry was appointed Constable of Roxburgh Castle, Scotland in 1458 until 1460. He fought on the side of Henry VI and the House of Lancaster during the Battle of Wakefield 30 December 1460, at Mortimers Cross 2 February 1461, in the 