Johann Osthoff von Mengede
Johann von Mengede was a knight of the Teutonic Knights. Most notably, from 1442 to 1450, he was Komtur of Reval and then from 1450 to 1469 a Master of the Livonian Order. He was elected as the Landmaster of Livonia in April, 1450.
He is the best known representative of the Brandenburg noble family from :de:Haus Mengede| Mengede.History
In 1461—1464, when Landmaster of Livonia Johann von Mengede arrested the Archbishop of Riga, :de:Silvester Stodewescher|Silvester Stodewescher and plundered Archbishopic lands, troops from Pskov occupied the eastern part of the Archbishopic lands — :de:Adzele|Adzele. Adzele inhabitants were either deported or converted to Orthodoxy.
