Pope Francis, center, sits as the coffin of late Pope Emeritus Benedict XVI St. Peter's Square is carrying for a funeral mass at the Vatican, Thursday, Jan. 5, 2023. (AP Photo / Alessandra Tarantino)

Benedict XVI is considered one of the 20th century’s greatest theologians and spent his lifetime upholding church doctrine. But he will go down in history for a singular, revolutionary act that changed the future of the papacy: He retired, the first pope in six centuries to do so.

As Pope Benedict XVI prepares for his last weeks in office, we speak with Father Don Senior about what it's like to live in Vatican City. 

In a surprise announcement, Pope Benedict XVI said that he is renouncing the papacy at the end of February, citing his deteriorating health.