A bishop is a religious authority figure in some Christian churches. In many churches, a bishop ordains, or appoints, ministers and priests.
In Christian traditions ranging from Roman Catholic to Lutheran, bishops play an important role in church oversight. In many orthodox and Catholic churches, bishops are believed to be the successors to the original twelve apostles from the Bible's New Testament. The chess piece called the bishop comes from this religious figure, and the word itself comes from the Greek episkopos, "watcher or overseer."