On 15 December 1540 a secret conference took place between Johann Gropper, canon of Cologne, and Gerhard Veltwick, the Imperial secretary, on the one side and Butzer and Capito, the delegates of Protestant Strasbourg, on the other.
On December 15, 1540, a secret meeting took place between Johann Gropper, the canon of Cologne, and Gerhard Veltwick, the Imperial secretary, representing their respective sides, along with delegates from Protestant Strasbourg, namely Butzer and Capito.