Johann von Mengede (also Johann von Mengden, called Osthof) ( â 15 August 1469) 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 (Landmiester) of the Livonian Order. He was elected as the Landmaster of Livonia in April, 1450.
He is the best known representative of the noble family from .
In 1461âÂÂ1464, when Landmaster of Livonia Johann von Mengede arrested the Archbishop of Riga, and plundered Archbishopic lands, troops from Pskov occupied the eastern part of the Archbishopic lands â (presently Pytalovo). Adzele inhabitants were either deported or converted to Orthodoxy.