But the Opstalboom league did not consist only of Frisians, as the area of Zevenwouden and the city of Groningen were Saxon.
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Groningen has been a province of the Netherlands since the 16th century.
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The free Frisians (actually petty noblemen) and the city of Groningen founded the Opstalboom League to counter feudalism.
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The 7th-century Frisian realm (650-734) under the kings Aldegisel and Redbad, had its centre of power in the city Utrecht.
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