ROME (AP) — Pope Leo XIV marked the 56th anniversary of man’s arrival on the moon Sunday with a visit to the Vatican astronomical observatory in Castel Gandolfo and a call to astronaut Buzz Aldrin.

VATICAN CITY, — Robert Prevost, the new pope selected after Pope Francis' death, has chosen the name Leo, used by 13 popes before him dating back to the 5th century. To understand his choice, it ...

VATICAN CITY, — Robert Prevost, the new pope selected after Pope Francis' death, has chosen the name Leo, used by 13 popes before him dating back to the 5th century. To understand his choice, it ...

The last Pope Leo was Leo XIII, who was born in French-occupied Rome in 1810. He served as pope from 1878 until his death in 1903, making his 25-year papacy the fourth longest in the church’s ...

Pope Leo XIII, who was head of the Catholic Church from 1878 to 1903, laid the foundation for modern Catholic social thought, most famously with his 1891 encyclical Rerum Novarum, which addressed ...

Pope Leo XIII, who served from 1878 to 1903, led the church into the modern world, emphasizing its moral authority beyond national boundaries. He defended the rights of working people and affirmed ...

Pope Leo XIII, who was head of the Catholic Church from 1878 to 1903, laid the foundation for modern Catholic social thought, most famously with his 1891 encyclical Rerum Novarum, which addressed ...

Pope Leo XIII, who was head of the Catholic Church from 1878 to 1903, laid the foundation for modern Catholic social thought, most famously with his 1891 encyclical Rerum Novarum, which addressed ...

Pope Leo XIII, who was pope from 1878-1903, is known for publishing the encyclical “Rerum Novarum” on worker’s rights — considered the foundational document for the church’s social teaching.

Other popes have since built on the teachings laid out in the encyclical, including Pope Pius XI’s 1931 encyclical Quadragesimo Anno on the 40th anniversary of Leo XIII’s writing and Pope John ...