The Bishopric of Reval was created in Duchy of Estonia by Valdemar II of Denmark in 1240. Contradictory to canon law Valdemar II reserved the right to appoint the bishops of Reval to himself and his successor kings of Denmark. The decision to simply nominate the see of Reval was unique in the whole Catholic Church at the time and was disputed by bishops and the Pope. During the era, the election of bishops was never established in Reval and the royal rights to the bishopric and to nominate the bishops was even included in the treaty when the territories of the Duchy of Estonia were sold to Teutonic Order in 1346.
The Bishopric of Reval came to an end during the Protestant Reformation in the Livonian Confederation. The last titular bishop of the see was Magnus, Duke of Holstein younger brother of Frederick II of Denmark who had bought Bishopric of Ösel-Wiek on the eve of the Livonian War. Magnus landed on Ösel (Saaremaa) in 1560 and soon after the bishop of Reval also resigned his bishopric to Magnus' hands. Magnus' attempt to gain control of the Toompea Castle in Reval was prevented by Gotthard Kettler, the master of Livonian Order. In 1561 Eric XIV of Sweden took control over Reval and after the Livonian war it became the capital city of Swedish Estonia.