Winchcombe Abbey is a now-vanished Benedictine abbey in Winchcombe, Gloucestershire, this abbey was once the capital of Mercia, an Anglo Saxon kingdom at the time of the Heptarchy in England. The Abbey was founded c. 798 for three hundred Benedictine monks, by King Offa of Mercia or King Kenulf. In its time, it was the burial place of two Mercian princes, Kenulf and his son St.