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Leo VIII was ordained a bishop, claiming the Holy See as an antipope supported by Otto the Great.
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Pope Leo VIII
Head of the Catholic Church from 964 to 965
Pope Leo VIII was a Roman prelate who claimed the Holy See from 963 until 964 in opposition to John XII and Benedict V and again from 23 June 964 to his death. Today, he is considered by the Catholic Church to have been an antipope during the first period and the legitimate pope…Source: Wikipedia (CC BY-SA)
Bishop
Leadership position in religious institutions
A bishop is an ordained member of the clergy who is entrusted with a position of authority and oversight in a religious institution. In Christianity, bishops are normally responsible for the governance and administration of dioceses. The role or office of the bishop is called…Source: Wikipedia (CC BY-SA)
Holy See
Jurisdiction of the Catholic Church and Vatican City
The Holy See, also called the See of Rome, the Petrine See or the Apostolic See, is the central governing body of the Catholic Church and Vatican City. It encompasses the office of the pope as the bishop of the apostolic episcopal see of Rome, and serves as the spiritual and…Source: Wikipedia (CC BY-SA)
Antipope
Person who claims to be the legitimate pope
An antipope is a person who claims to be Bishop of Rome and leader of the Roman Catholic Church in opposition to the officially elected pope. Between the 3rd and mid-15th centuries, antipopes were supported by factions within the Church itself and secular rulers. While modern…Source: Wikipedia (CC BY-SA)
Otto the Great
Holy Roman Emperor from 962 to 973
Otto I, known as Otto the Great or Otto of Saxony, was East Frankish (German) king from 936 and Holy Roman Emperor from 962 until his death in 973. He was the eldest son of Henry the Fowler and Matilda of Ringelheim.Source: Wikipedia (CC BY-SA)