The birk thing was initially held in Ballerup but from 1803 moved to Blåtårn in Copenhagen.
Copenhagen County comprised the hundreds of Sokkelund and Smørum and the parishes of g Farum, Ganløse, Slagslunde, Stenløse, Viksø and Værløse in Ølstykke Herred.
In January 1683, he proposed that three hundreds of Sokkelund, Smørum and Ølstykke be merged into a single jurisdiction.
It comprised the three hundreds with the exception of Copenhagen proper (Københavns Byting), Amager (Christianshavn Byting, Taarnby Birketing, and the Dutch thing in Store Magleby and Ny Hollænderby).
As proposed by Knuth, Ballerup was selected as the location of the local birk thing.