Pius V was an important figure in the Catholic Church during the 16th century. There are a variety of synonyms that can be used to refer to him, including Saint Pius V, Pope Pius V, Giovanni Michele Ghislieri, and Michael Ghisleri. These names are all used to refer to the same person, who was born in 1504 and served as the Pope from 1566 until his death in 1572. Pius V is known for his efforts to strengthen the Catholic Church and his role in the Counter-Reformation. His legacy continues to be celebrated by Catholics around the world.