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In the treaty, Charles of Guelders handed over the City of Groningen, the Ommelanden and Drenthe to Emperor Charles.
One of the main municipal secondary schools in the city of Groningen, the H.N. Werkman College was named after him and keeps Werkman's heritage alive in its art classes and recurring special projects.
The population always spoke a Frisian dialect, but, by uniting the city of Groningen with the surrounding district, that Frisian merged into the Low Saxon (Platduuts) of the city, though the language of the surrounding countryside still retains a strong Frisian substrate.