As is suggested by his four elections as mayor of Reading within the space of just seven years, Kirkby numbered among the most prominent of the burgesses. While holding office he was returned to the Parliaments of 1429 and 1433, and as mayor he lent his authority to the parliamentary indenture dated 14 Apr. 1432. He twice attested other electoral indentures.
Kirkby is not recorded after January 1442, when he last attested a parliamentary indenture at Reading, and he died at least two years before 26 Mar. 1449. On that date William Lyncoln of Reading, a writer of court-hand, came before the mayor and aldermen of London and exhibited the transcript of a deed dated the third year of Henry VI (1424-5) whereby John Lyncher and his wife had settled on Kirkby and his wife, Anne, and Kirkby’s heirs a tenement in Horner Street, Reading. This Lyncoln declared on oath to be a true deed, but then showed the court a transcript of another deed of the same date, purporting to be a grant of the same property with remainder not only to Kirkby’s heirs but also to the assigns of him and his wife. He connfessed that two years after Kirkby’s death he had forged this second document at the request of the MP’s widow.
