Pius IV, Pope 1559-1565
Muntoni 68; Berman 1074c, PCGS graded AU-55
Bologna. PIVS IIII PONT MAX, Papal arms. Reverse: BONONIA DOCET, cross fleury between two shields.
Upon his accession to the Throne of St. Peter, Pope Pius IV immediately arrested the surviving nephews of Paul IV, ordering the execution of one and the imprisonment of another. His most important work, however, was the reconvening of the Council of Trent in 1562. After much wrangling, the Pope was able to firmly establish the position of the Catholic Church against Protestantism with the support of the rulers of France, Spain, and the Holy Roman Empire. The successful conclusion to the Council of Trent provided the framework for the Counter-Reformation and the basis for the Tridentine Mass that remained the standard from of worship for 400 years.