Watch List notes:

Papal States. Paul V. 1605-1621. AR 1/2 grosso (16 mm, 0.59 g, 7 h). Rome mint, ND. Papal arms / St. Paul standing; mint master's mark below right. Berman 1576. Fine, reverse slightly double struck. 

It was Paul V who censured the humanist astronomer Galileo Galilei in 1616 for espousing Copernican theory.