Lothario studied in Rome and then Paris. After the death of Pope Alexander III, Lothario returned to Rome and worked for the papacy during the terms of Lucius III, Urban III, Gregory VIII (who made him a subdeacon), and Clement III (who made him a cardinal-priest).
He showed his education and value by writing a work (completed by April 1195) that became very popular for several centuries. De Miseria Condicionis Humane "On the Misery of the Human Condition" survived in over 700 manuscripts, an extraordinary number. It addresses the hardships of the human body, the futility of man's ambitions, and the consequences of death and decay and the Day of Judgment. Geoffrey Chaucer made his own translation of it (now lost). Lothario stated his intention to write a companion piece, On the Dignity of Human Nature, he never got around to it.
Pope Celestine III succeeded Clement III in 1191. He later wished to resign the position in favor of Cardinal Giovanni di San Paolo—he was in his 90s—but the cardinals would not allow it. Celestine died 8 January 1198, and the cardinals chose Lothario that same day after only two ballots. He was only 37, and took the regal name Innocent III.
Although he only reigned until July 1216, in those 18 years he accomplished much and was considered the most powerful man in Europe. He used the weapon of interdiction and Crusades and official letters to bring Roman Catholics into line with his policies and preferences.
Next time, we'll examine his attempts to bring the whole world under Catholic dominion.