Westminster School and Westminster Abbey Choir School are also in the precincts of the abbey. It was natural for the learned and literate monks to be entrusted with education, and Benedictine monks were required by the Pope to maintain a charity school in 1179. The Choir School educates and trains the choirboys who sing for services in the Abbey.

Answer this question, if possible (if impossible, reply "unanswerable"): Who required the Benedictine monks to maintain a vanity school?
unanswerable