John I, Margrave of Brandenburg
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John I, Margrave of Brandenburg was from 1220 until his death Margrave of Brandenburg, jointly with his brother Otto III "the Pious".
Monument to John I (sitting) and his brother Otto III in the Siegesallee in Berlin, by Max Baumbach.
Plauer See, the scene of a battle against Magdeburg in 1229
John I (sitting) and Otto III studying the (alleged) city charter of Berlin and Cölln (now in the Spandau Citadel)
Berlin and Cölln around 1230
Margraviate of Brandenburg
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The Margraviate of Brandenburg was a major principality of the Holy Roman Empire from 1157 to 1806 that played a pivotal role in the history of Germany and Central Europe.
Slavic territories pre-Brandenburg, c. 1150
Siegesallee statue of Albert the Bear, flanked by Bishop Wigger of Brandenburg and Bishop Otto of Bamberg
The Holy Roman Empire from 1273 to 1378: Habsburg lands Luxembourg lands Wittelsbach lands
Religion in Central Europe, c. 1618. Electoral Brandenburg is striped, indicating that its ruler was a Calvinist, while most of his subjects remained Lutheran. Lutherans Calvinists Zwinglians Hussites/Bohemian Brethren Roman Catholics Greek Orthodox Muslims