 The source of the bronze to make the structure was an issue of contemporary controversy as it was believed to have been taken from the roof or portico ceiling of the ancient Roman Pantheon, though Urban's accounts say that about ninety percent of the bronze from the Pantheon was used for a cannon, and that the bronze for the baldachin came from Venice.A well-known satirical lampoon left attached to the ancient ‘speaking’ statue of Pasquino on a corner of the Piazza Navona, said