Fulk FitzWarin, variant spellings, the third, was a prominent representative of a marcher family associated especially with estates in Shropshire and at Alveston in Gloucestershire. In young life, early in the reign of King John (1199–1216), he won notoriety as the outlawed leader of a roving force striving to recover his familial right to Whittington Castle in Shropshire, which John had granted away to a Welsh claimant. Progressively rehabilitated, and enjoying his lordship, he endured further setbacks in 1215–1217.

Shropshire is a ceremonial county in the West Midlands of England, on the Welsh border. It is bordered by Wrexham County Borough and Cheshire to the north, Staffordshire to the east, Worcestershire to the south-east, Herefordshire to the south and Powys to the west. The largest settlement is Telford, and Shrewsbury is the county town.