Saint Pius V, né Antonio Ghislieri, from 1518 called Michele Ghislieri (January 17, 1504 – May 1, 1572) was Pope from 1566 to 1572 and is a saint of the Catholic Church. Early on involved in the Inquisition, as Pope he resisted the influence of Protestants.

He was born as Antonio Ghislieri at Bosco in the duchy of Milan. At the age of fourteen he entered the Dominican Order, taking the name Michele, passing from the monastery of Voghera to that of Vigevano, and thence to Bologna. Having been ordained priest at Genoa in 1528, he settled at Pavia, where he lectured for sixteen years. He soon gave evidence of the opinions which found a more practical expression in his pontificate, by advancing at Parma thirty propositions in support of the papal chair and against the heresies of the time. As president of more than one Dominican monastery during a time of great moral laxity in the Catholic Church, he stood against the trend of the times by insisting on strict discipline, and, in accordance with his own wish to discharge the office of inquisitor, received an appointment to that post at Como. His reformist zeal provoking resentment, he was compelled in 1550 to return to Rome, where, after having been employed in several inquisitorial missions, he was elected

Pontificate

Before Ghislieri could return to his episcopate, Pius IV died, and on January 7, 1566, he was elected to the papal chair as Pius V with duly attendant prodigies, his coronation taking place on his birthday, ten days later. Fully alive to the necessity of restoring discipline and morality at Rome to ensure success without, he at once proceeded to reduce the cost of the papal court after the manner of the Dominican Order to which he belonged, compel residence among the clergy, regulate inns, expel prostitutes, and assert the importance of the ceremonial in general and the liturgy of the Mass in particular. In his wider policy, which was characterized throughout by an effective stringency, the maintenance and increase of the efficacy of the Inquisition and the enforcement of the canons and decrees of the Council of Trent had precedence over other considerations. The prudence of Comniendone saved him at the commencement of his pontificate from trouble with Germany, as in the general diet of the empire at Augsburg (March 26, 1566). Pius V recognized attacks on papal supremacy in the Catholic Church and was desirous of limiting their advancement. In France, where his influence was stronger, he took several measures to oppose the protestant Huguenots. He directed the dismissal

In the list of more important bulls issued by him the famous bull In Coena Domini (1568) takes a leading place; but amongst others throwing light on Pope Pius V's character and policy there may be mentioned his prohibition of quaestuary (February 1567 and January 1570); the condemnation of Michael Baius, the heretical Professor of Leuven (1567); the reform of the breviary (July 1568); the denunciation of the dirum nefas (August 1568); the banishment of the Jews from the ecclesiastical dominions except Rome and Ancona (1569); the injunction of the use of the reformed missal (July 1570); the confirmation of the privileges of the Society of Crusaders for the protection of the Inquisition (October 1570); the dogmatic certainty of the miraculous conception (November 1570); the suppression of the Fratres Humiliati for profligacy (February 1571); the approbation of the new office of the Blessed Virgin (March 1571); the enforcement of the daily recitation of the canonical hours (September 1571); and the purchase of assistance against the Turks by offers of plenary pardon (March 1572). His response to the reforms of Elizabeth I of England (1558–1603) included support of Mary I of Scotland (1542–67) and her supporters in their attempts to take over England "ex turpissima muliebris libidinis servitute". An important event in the history of Elizabethan England was the publication of a bull, Regnans in Excelsis, dated April 27, 1570, that declared Elizabeth I a heretic and released her subjects from their allegiance to her. This transformed the status English Roman Catholics from religious dissidents to potential enemies of the state.

Pius V persistently and successfully attempted to form a general league against the Turks, as the result of which the Battle of Lepanto (October 7, 1571) was won by the combined fleet under Colonna. Three national synods were held during his pontificate at Naples under Cardinal Alfonso Caraffa (whose family had, after inquiry, been reinstated by Pius V), at Milan under Charles Borromeo, and at Machim.

After his election to the papacy, Pius V continued to wear white, the color of his Dominican habit. Every Pope since him has also worn white clothing. Prior to Pius V, Popes, like Cardinals, wore red. This is why some papal accessories, such as the papal shoes, camauro, mozzetta, and cappello romano, are red.

Pius V died on May 1, 1572, and buried in the Basilica di Santa Maria Maggiore. He was succeeded by Pope Gregory XIII (1572–85). Pius V was canonized by Pope Clement XI (1700–21) on May 24, 1712.

Pope Pius V is also a patron saint of the Maltese Islands and helped financially in the construction of the city of Valletta.

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