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In page Capitoline Wolf:

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The age and origin of the Capitoline Wolf are controversial. The statue was long thought to be an Etruscan work of the fifth century BC,[1] with the twins added in the late 15th century AD, probably by sculptor Antonio del Pollaiuolo.[2] However, radiocarbon and thermoluminescence dating in the 21st century has suggested that the wolf portion of the statue may have been cast between 1021 and 1153,[3] though the results are inconsistent, and there is yet no consensus for a revised dating. In a conference on this theme, most academics continued to support an ancient Etruscan origin.[citation needed] An analysis of the metal suggests that it contains lead from a source not known to have operated during medieval times.[4]