Sir William Killigrew (died 1622) of Hanworth, Middlesex, was a courtier to Queen Elizabeth I and to her successor King James I, whom he served as Groom of the Privy Chamber.
[4] The monumental brass of John III Killigrew survives in St Budock's Church, near Arwenack.
He became feodary and escheator for the Duchy of Cornwall and Constable of Launceston Castle in 1576 by which year he was Groom of the Privy Chamber to Queen Elizabeth I.
He was receiver for Devon and Cornwall by 1588 and was commissioner for goods from Madre de Dios in 1592.
By his wife he had the following progeny:[6] In 1594 he obtained an 80-year lease of the two adjoining royal manors of Kempton and Hanworth in Middlesex.