Louis Billot

Louis Billot (12 January 1846 in Sierck-les-Bains, Moselle, France – 18 December 1931 in Ariccia, Latium, Italy) was a French Jesuit priest and theologian. He became a cardinal in 1911 and resigned from that status in 1927, the only person to do so in the twentieth century. While largely unknown in the modern age, he was nonetheless considered "the most important Thomistic speculative theologian of the late nineteenth century."