Pope Saint Pius V
Throughout the almost two millennia of papal history, 80 pontiffs have been regarded as saints. Some were venerated for their piety or godliness, some for their martyrdom. In the case of Pius V (1502-1572), born Antonio Ghislieri in northern Italy, one can attribute his canonization to his firmness of purpose in defending Roman Catholicism against Protestantism and Islam.
Ghisleri joined the Order of Preachers in his teens and went on to acquire a reputation as a theologian and reformer. He rose high in the ranks of the Inquisition. In his role as Dominican prior and then bishop he acted harshly against those he deemed to be corrupt clergy, cracking down on nepotism, absenteeism, theological novelty and moral laxity. During his six years as pope he took actions that would have long-lasting consequences.
The Council of Trent had mandated changes to the Mass which Pius was anxious to enforce. In 1570 he ordered a standardized version of the liturgy which came to be known as the Tridentine Mass that would endure for almost 400 years until the Vatican II Council of the 1960s. Politically, he was active in opposing the French government’s attempts to compromise with native Protestants — the Massacre of St Bartholomew which occurred shortly after his death would have been applauded by Pius V. He was instrumental in organizing and funding the Holy League to oppose Islamic expansion in the Mediterranean and the naval victory at Lepanto owed much to his impetus in uniting Catholic Europe. He was less successful — in fact, he was downright disastrous — in his policies against Protestant England. His support for the Rebellion of the Earls and his bull “Regans in Excelsis” which excommunicated Queen Elizabeth I hardened the heart of the English government against Catholics.