Cardinal Giovanni Battista Colonna was an Italian cleric and a prominent figure in the Roman Catholic Church during the late 16th and early 17th centuries. Born in 1533, he became known for his diplomatic skills and played a significant role in various church affairs, including the Council of Trent, which aimed to address issues within the Church. Colonna was appointed a cardinal in 1586 by Pope Sixtus V. He was involved in the governance of the Church and contributed to the reform efforts of the time. His legacy includes his influence on church politics and his commitment to the Catholic faith until his death in 1608.