Aylesbury replaced Buckingham as the county town of Buckinghamshire in 1529 by order of King Henry VIII . Aylesbury was declared the county town of Buckinghamshire in 1529 by King Henry VIII : Aylesbury Manor was among the many properties belonging to Thomas Boleyn the father of Anne Boleyn and it is rumored that the change was made by the king in order to curry favor with the holders of the manor . ( Previously the county town of Buckinghamshire was Buckingham ) .