Aspects of this topic are discussed in the following places at Britannica.
...Genoese statesman and admiral Andrea Doria. For the first time the struck medal became a common instrument of court propaganda, especially for the popes and for the ruling Medici family in Florence. Galeotti made more than 80 cast portrait medals, which rival the work of Leoni. Pastorino da Siena produced a long series of portraits of sitters of lesser rank, cast in lead without reverse type....
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