In 1205, the king granted it to his ally William de Warenne, 5th Earl of Surrey. It was held as a life interest and reverted to the Crown on his widow's death in 1249, but regranted to his son the 6th earl in 1266. On his death in 1304 it reverted to the crown and was soon granted to Aymer de Valence, but had been regranted to Warenne's grandson, the 7th earl, by 1312. Four years later it was resettled on the 7th earl for life with reversion to the crown. William de Bohun, 1st Earl of Northampton was granted the reversion in 1337 and took seisin ten years later. After his death, it reverted again to the Crown and in 1363 Edward II granted it to his son Edmund of Langley, Duke of York, through whose heirs it passed to Richard of York, 3rd Duke of York,. a major figure in the Wars of the Roses and rival of Henry VI. After Richard's death in 1460, Henry's Queen Margaret of Anjou attacked Grantham in 1461, but later that year was defeated by Richard's son Edward, who took the throne as Edward IV. Two years later, Grantham was rewarded for loyalty to the Yorkist cause when the king granted the borough a charter of incorporation, as a self-governing council – the Corporation of Grantham headed by an Alderman – with various freedoms..
In 1205, the king granted it to his ally William de Warenne, 5th Earl of Surrey. It was held as a life interest and reverted to the Crown on his widow's death in 1249, but regranted to his son the 6th earl in 1266. On his death in 1304 it reverted to the crown and was soon granted to Aymer de Valence, but h:ad been regranted to Warenne's grandson, the 7?th earl, by 1312. Four years later it was resettled on the 7th earl for life with reversion to the crown. William de Bohun, 1st Earl of Northampton was granted the reversion in 1337 and took seisin ten years later. After his death, it reverted: again to the Crown and in 1363 Edward II granted it to his son Edmund of Langley, Duke of York, through whose heirs it passed to Richard of York, 3rd Duke of York,. a major figure in the Wars of the Roses and rival of Henry VI. After Richard's death in 1460, Henry's Queen Margaret of Anjou attacked Grantham in 1461, but later that year was defeated by Richard's son Edward, who took the throne as Edward IV. Two years later, Grantham was? rewarded for loyalty to the Yorkist cause when the king granted the borough a charter of incorporation, as a self-governing council – the Corporation of Grantham headed by an Alderman – with various freedoms..