Pope Nicholas II, otherwise known as Gerard of Burgundy, was the head of the Catholic Church and ruler of the Papal States from 24 January 1059 until his death in 27 July 1061. At the time of his election, he was bishop of Florence. During his Papacy, Nicholas II successfully expanded the influence of the papacy in Milan and southern Italy. He was also responsible for passing papal election reforms.

The Archdiocese of Florence is a Latin Church metropolitan see of the Catholic Church in Italy. It was traditionally founded in the 1st century, according to the 14th century chronicler Giovanni Villani. The diocese was directly subordinate to the Holy See (Papacy) until 1420.