Before becoming Pope Leo XIV, Cardinal Robert Prevost presided over one of the most revolutionary reforms of Pope Francis’ pontificate by having women serve on the Vatican board that vets nominations

Cardinal Robert Francis Prevost – now known as Pope Leo XIV — is the first pope from the United States. The 69-year-old from Chicago is known as a leader with global experience. He spent much of his career as a missionary in South America and most recently led a powerful Vatican office for bishop appointments.

Robert Prevost has been named the new pope. But why did he opt to select the title Leo XIV? Here's a closer look at its history.