Gerald de Windsor, alias Gerald FitzWalter, was an Cymro-Norman lord who was the first Castellan of Pembroke Castle in Pembrokeshire. Son of the first Norman-French Constable of Windsor Castle, and married to a Welsh Princess daughter of the King of Deheubarth, he was in charge of the Norman forces in south-west Wales. He was also steward and governor for the Norman magnate Arnulf de Montgomery. His descendants were the FitzGerald dynasty, as well as the FitzMaurice, De Barry, and Keating dynasties of Ireland, who were elevated to the Peerage of Ireland in the 14th century. He was also the ancestor of the prominent Carew family, of Moulsford in Berkshire, the owners of Carew Castle in Pembrokeshire and of Mohuns Ottery in Devon.

Pembroke Castle is a medieval castle in the centre of Pembroke, Pembrokeshire in Wales. The castle was the original family seat of the Earldom of Pembroke. A Grade I listed building since 1951, it underwent major restoration during the early 20th century.