According to Acts, Paul began his third missionary journey by travelling all around the region of Galatia and Phrygia to strengthen, teach and rebuke the believers. Paul then traveled to Ephesus, an important center of early Christianity, and stayed there for almost three years, probably working there as a tentmaker, as he had done when he stayed in Corinth. He is claimed to have performed numerous miracles, healing people and casting out demons, and he apparently organized missionary activity in other regions. Paul left Ephesus after an attack from a local silversmith resulted in a pro-Artemis riot involving most of the city. During his stay in Ephesus, Paul wrote four letters to the church in Corinth. The Jerusalem Bible suggests that the letter to the church in Philippi was also written from Ephesus.