"The Province of Saxony (German: Provinz Sachsen), also known as Prussian Saxony (Preußische Sachsen) was a province of the Kingdom of Prussia and later the Free State of Prussia from 1816 until 1945. Its capital was Magdeburg.
It was formed by the merger of various territories ceded or returned to Prussia in 1815 by the Congress of Vienna: most of the former northern territories of the Kingdom of Saxony (the remainder of which became part of Brandenburg or Silesia), the former French Principality of Erfurt, the Duchy of Magdeburg, the Altmark, the Principality of Halberstadt, and some other districts." - (en.wikipedia.org 29.01.2020)
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