Pope John XV
During his time as pope, there was a dispute that arose over the deposition in 991 of Arnulf, Archbishop of Reims. Arnulf was made archbishop of Reims in 988 by Hugh Capet of France. Arnulf was the nephew of the King's bitter rival, Charles of Lorraine and considered Arnulf a turncoat. He demanded his deposition by John XV. Hugh Capet captured both Charles and Archbishop Arnulf and convoked a synod at Reims in June 991. He deposed Arnulf and chose as his successor Abbot Gerbert of Aurillac who would later be known as Pope Silvester II.