The bronze statue of St Peter was placed on Trajan's Column by
Pope Sixtus V in 1587.
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No, the column is granite, the sculpture on top is
sandstone.
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a pedestal
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The Trafalgar Square column, in London, is topped by a statue of
Horatio Nelson. He was the vice admiral who commanded the British
Fleet at (and was killed at) the Battle of Trafalgar.