... Sir William married three times. The first was to Alice Grey (d. 1474), daughter of John Grey, Esq., of Kempston ...
... At New Buckenham, in 1888, the following inscription was found on a brass, loose in the Church Chest:
To the memory of Alice, wife of William Knyvet, Esq., dau. of John Grey, son of Reginald Grey, Lord of Rythin, who died 4 April, 1474. ...