 He came to the fore through his knowledge and moderation.In 1627, he was delegated to go to Sweden and Poland, to close negotiations between these two countries, mediate a peace (culminating in the Treaty of Sztumska Wieś) and at the same time set up new Baltic trade agreements.In 1631 he was the owner of a few plots in "Spanderswoud" in 's-Graveland, the site where now the fine Trompenburgh house stands.