Greece's top religious leader asked Pope Benedict on Thursday to return a piece of the Parthenon in the Vatican Museums, Greek officials said.

Christodoulos, Orthodox archbishop of Athens and of all Greece, made the request during a visit when he and the Pope signed a joint declaration on issues of common concern, such as the defense of life.

According to spokesmen for Christodoulos, the Pope was a bit perplexed by the request, perhaps not knowing that the vast museums he technically owns as sovereign of Vatican City have a fragment of the 5th century BC structure.

He said he would consider the request, they said.