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The Treaty of Speyer, signed at the Diet of Speyer in 1570, was a peace agreement between the two Hungarian Kingdoms as Royal Hungary led by Maximiliam II and the Eastern Hungarian Kingdom ruled by John Sigismund Zápolya. John Sigismund abdicated as King of Hungary, however Maximiliam II recognized John Sigismund's authority as "Prince of Transylvania" and in return John Sigismund accepted Maximiliam II as King of Hungary with vassalage over his principality.[1]

John Sigismund's realm in 1570

John Sigismund became princeps Transsylvaniae et partium regni Hungariae dominus – Prince of Transylvania and of a part of the Kingdom of Hungary.[2] According to the treaty Principality of Transylvania continued to be part of the Kingdom of Hungary in the sense of public law.[3]


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