Most of the artefacts from the ancient Kingdom of Benin that ended up in museums around the world, left the country following the British army’s looting of the country in 1897.
This song (forwarded to my by Kwame Opoku) details the massacre, followed by the (so far unsuccessful) attempts to have some of these artefacts returned to their country of origin. Perhaps someone needs to produce something similar to help publicise the campaign for the return of the Parthenon Marbles & to correct some of the popular misconceptions so that people better understand the true situation.
Listen to (& watch) it here [1].