The last Leo to sit the Papacy was a social reformer.
The last pope to take the name Leo was
Pope Leo XIII. He served as the head of the Roman Catholic Church from February 20, 1878, until his death on July 20, 1903
25. Born Vincenzo Gioacchino Raffaele Luigi Pecci in 1810, he was notable for his efforts to modernize the Church, promote social reform, and encourage harmony between science and religion
34. Leo XIII was the longest-lived pope in history, dying at the age of 93
5.
His papacy was marked by significant diplomatic engagement, the revival of Thomist philosophy, and the issuance of important encyclicals such as
Rerum Novarum, which addressed the rights and conditions of workers
4. After his death, he was succeeded by Pope Pius X.