Which Pope Excommunicated Martin Luther?

In 1520, Leo issued the papal bull Exsurge Domine demanding Luther retract 41 of his 95 theses, and after Luther's refusal, excommunicated him.

Who excommunicated Martin Luther from the Catholic Church?

Title page of Leo X's papal bull Decet Romanum Pontificem. Published in 1521, the bull excommunicated the German Protestant reformer Martin Luther from the Roman Catholic Church. Leo X had not viewed the Lutheran movement with the seriousness that history later indicated was warranted.

Why was Martin Luther excommunicated by pope?

On June 15, 1520, he issued the bull Exsurge Domine (“Arise Oh Lord”) stating that 41 sentences in Luther's 95 Theses were heresy. The Pope gave Luther 60 days to recant these words and another 60 to inform the papacy of his cooperation. If not, the bull said, Luther would be excommunicated.