Pope Benedict XVI will step down Feb. 28, making him the first pontiff to resign in 600 years.
In making the unexpected announcement Monday in Rome where he spoke in Latin, Pope Benedict XVI cited advanced infirmities as the reason for his resignation.
"I have come to the certainty that my strengths, due to an advanced age, are no longer suited to an adequate exercise [of leadership]," the pope said in a statement that has circulated around the globe via the Internet and social media.
The 85-year-old pope has served at the helm of the Roman Catholic world for the past eight years.