Neil MacGregor continues his series on the expression of shared beliefs in communities around the world and across time, and focuses on sacrifice..

Displayed in the British Museum is a finely-crafted Aztec knife, dating from around 1500, with a richly-decorated handle. It had a brutal purpose - human sacrifice.

In ancient Greece, animal sacrifice was a vital ritual for connection with the deities: the grounds of a Greek temple were in part a sacred public slaughter-house.

Producer Paul Kobrak

Produced in partnership with the British MuseumPhotograph (c) The Trustees of the British Museum.