His Holiness Pope Pius IV (in Latin Pius Quartus) is the Pope number 224 of the Catholic Church.
Giovanni Ángelo de Médicis was born in Milán, in the current country of Italy.
The Holy Father Pius IV initiated his pontificate in the year 1559. He succeeded Pope Paul IV. His papacy lasted for 6 years, ending during the year 1565. He was succeeded by Pius V, who would become the following bishop of Rome.