An imperial castle or Reichsburg was a castle built by order of the German or Holy Roman Emperor, whose management was entrusted to Reichsministeriales or Burgmannen.
In Salzburg, Austria a Timo appears in 1125/47 in the traditionsbuch (book of traditions) as a miles (knight) of the archiepiscopal ministerialage who functioned as burgrave and also as a merchant.
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Ministerial marriage was subject to review or approval of the liege, as in Salzburg:In July 1213 Archbishop Eberhard II of Salzburg (1200–1246) and Bishop Manegold of Passau (1206–1215) asked King Frederick II at the imperial court held at Eger (today Cheb in the Czech Republic) to confirm the marriage contract that Gerhoch II of Bergheim-Radeck, an archiepiscopal ministerial, had made with Bertha of Lonsdorf, a Passau ministerial.
It was founded as Marienzelle by Ludolf the Wend, a ministerialis of Henry the Lion and steward of Brunswick, and settled in 1145 by monks from Amelungsborn Abbey.
The Kuenring family of ministeriales fell from grace after the extinction of the ruling House of Babenberg in 1246, as they had sided with King Ottokar II of Bohemia against the rising Habsburg dynasty.
They were a ministerialis family (unfree knights), who came from the village of Bartensleben near Helmstedt.