The British Museum delayed the loan of the Cyrus Cylinder to Iran for a long time due to worries over the security of the loan & guarantees that the artefacts would be returned afterwards. After extensive re-assurances, the loan eventually went ahead. Many in Iran are still questioning whether it should be returned to the British Museum when the four months are up.

From:
Guardian

Iran lays claim to British Museum’s Cyrus Cylinder
Conservative Iranian newspaper raises concern that rare 6th century BC Babylonian artefact may not be returned
# Ian Black and Saeed Kamali Dehghan
Wednesday 15 September 2010 20.06 BST

It was not an easy decision for the British Museum to lend one of its most treasured artefacts to a country which has a notoriously prickly relationship with the UK. So curators in London are paying close attention to an Iranian threat not to return the famous Cyrus Cylinder — now embroiled in political intrigue in the Islamic Republic.

The 6th century BC Babylonian object, sometimes described as the world’s first human rights charter, arrived in Iran at the weekend and is due to be displayed for four months at the national museum.
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