Walter de Lacy may refer to:
Walter de Lacy (died 27 March 1085) was a Norman nobleman who came to England after the Norman Conquest of England in 1066. He received lands in Herefordshire and Shropshire, and served King William I of England by leading military forces during 1075. He died in 1085 and one son inherited his lands. Another son became an abbot.
Early life
Walter was originally from Lassy, in Normandy. He had a brother, Ilbert de Lacy. Ilbert was the ancestor of the de Lacy family of Pontefract. Both Walter and Ilbert jointly held the Norman lands that were held of the Bishop of Bayeux.
Career in England
Walter de Lacy (c. 1172–1241) was Lord of Meath in Ireland. He was also a substantial land owner in Weobley, Herefordshire, in Ludlow, Shropshire, in Ewyas Lacy in the Welsh Marches, and several lands in Normandy. He was the eldest son of Hugh de Lacy, a leading Cambro-Norman baron in the Norman invasion of Ireland.
Life
With his father he built Trim Castle (Irish: 'Caisletheán Bhaile Atha Troim) in Trim, County Meath.
During the revolt of Prince John Lackland, Lord of Ireland, against his brother, King Richard the Lionheart, in 1193-94, Walter joined with John de Courcy to support Richard. Walter apprehended some knights loyal to John along with Peter Pipard, John's justiciar in Ireland. Walter did homage to Richard for his lands in Ireland in 1194, receiving his lordship of Meath. After mounting the throne of England in 1199, John wrote to his justiciar in Ireland to complain that de Courcy and de Lacy had destroyed John's land of Ireland. Walter had made John his enemy.