A ring thought to belong to France's most famous historical martyr, Joan of Arc, was unveiled on Sunday at a theme park, even as historians remained skeptical about its authenticity.

The Puy du Fou historical theme park in the western Vendee region paid $425,000 for the ring, which is thought to have been in Britain for almost six centuries, at a controversial auction in February in London.

Some 5,000 spectators showed up for the unveiling on Sunday, with the ring carried on a cushion in a wooden ark, with its own honor guard and a military procession.