Innocent IV

Sinibaldo Fieschi · 1243 – 1254

A brilliant canon lawyer who fought Emperor Frederick II to a standstill and convened the First Council of Lyon.

Sinibaldo Fieschi was a Genoese nobleman and one of the finest legal minds of the medieval Church. Elected pope in 1243, he inherited a bitter conflict with Emperor Frederick II, who had been excommunicated by Gregory IX. When Frederick threatened Rome, Innocent fled to Lyon, where he convened a general council in 1245. The council formally deposed Frederick, an act of breathtaking papal assertiveness. Innocent also authorized the use of torture in inquisitorial proceedings, a decision that history has judged harshly. He sent missionaries to the Mongol Empire and wrote extensively on canon law. He outlived Frederick, who died in 1250, and returned to Italy. He died in Naples in 1254.

The Lawyer Pope

Innocent IV brought a lawyer's precision to the fight with Frederick II. His legal commentaries on papal power were so thorough that they became standard texts for centuries. He believed the pope had ultimate authority over all temporal rulers, a claim that would eventually overreach, but in his own context, it kept the Church independent.

A Painful Legacy

Innocent's authorization of torture in inquisitorial proceedings is one of the hardest parts of papal history to reckon with. It was legal pragmatism of the worst kind, and the Church eventually repudiated it. Honesty about past failures matters more than pretending they didn't happen.