This is Alice Colbroke, who was 1st married to John de Vere and was mother of John de Vere, 15th Earl of Oxford.
In all the records held at Kresen Kernow, Cornwall Records Office, the family is referred too as Colbroke, its is thought that the alias Kilrington was because the family once lived at Kilrington now Killerton, Broadclyst, Devon. .
Sources include :
Pedigree of Earl of Oxford Ref: AR/1/851 Date : 1531
naming Walter Colbroke and his wife Joan Tresithney, parents of Alice Colbroke, wife of John Veer.
Gift in Fee Tail Ref AR/1/849 Date : 15 March 1488
John Carminow, Nicholas Lower and William Upton, giving Joan, wife of Walter Colbroke, lands in Cornwall to hold for a term of her life and on her death to Alice lately wife of John de Vere.
Alice's family tree
Richard Tresithney of Tresithney, St Columb Major, Cornwall married Jane Tregennow of Tregennow, St Ewe, Cornwall
Joan Tresithney married Walter Colbroke
Alice married John de Vere - son John de Vere 15 Earl Oxford
on his death she married Sir Walter Courtenay - children Walter, William, Catherine
Walter and Alice are also mentioned in Chancery Proceedings Catalogue.pro.gov.uk Ref C1/127/29 Dated: 1486 - 1529
This mentions lands at Tregennow, Cornwall
