Magnus, Duke of Holstein and Magnus of Livonia were the same person; he was made Bishop of Courland in 1560 and was crowned King of Livonia by Ivan IV in 1570.
18 March] 1583) was a Prince of Denmark, Duke of Holstein, and a member of the House of Oldenburg. During the Livonian War, on 10 June 1570, Duke Magnus arrived in Moscow, where he was crowned King of Livonia by Ivan IV. In 1560, Magnus landed with an army on Saaremaa where he was immediately elected bishop by the cathedral chapter. 15601583 
