The Treaty of Speyer was signed in 1209 by Holy Roman Emperor Otto IV

Otto IV, Holy Roman Emperor

Otto IV of Brunswick was one of two rival kings of the Holy Roman Empire from 1198 on, sole king from 1208 on, and emperor from 1209 on. The only king of the Welf dynasty, he incurred the wrath of Pope Innocent III and was excommunicated in 1215.-Early life:Otto was the third son of Henry the...

. This agreement was developed as a result of Pope Innocent III

Pope Innocent III

Pope Innocent III was Pope from 8 January 1198 until his death. His birth name was Lotario dei Conti di Segni, sometimes anglicised to Lothar of Segni....

 having launched an appeal for organizing a crusade against the Cathars (or Albigensians) in southern France

France

The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

. The accord allowed Emperor Otto IV to renounce the Concordat of Worms

Concordat of Worms

The Concordat of Worms, sometimes called the Pactum Calixtinum by papal historians, was an agreement between Pope Calixtus II and Holy Roman Emperor Henry V on September 23, 1122 near the city of Worms...

 and claim authority over territories controlled by the Pope. These territories included the Kingdom of Sicily

Kingdom of Sicily

The Kingdom of Sicily was a state that existed in the south of Italy from its founding by Roger II in 1130 until 1816. It was a successor state of the County of Sicily, which had been founded in 1071 during the Norman conquest of southern Italy...

.