The same year, Frederik V entrusted Classen and another businessman, Just Fabritius, with land at Agatmølle, the point where the Arresø runs into Isefjorden, on which to develop a cannon and munitions factory.
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He also enjoyed friendships with the most influential figures of the times including Adam Gottlob Moltke, Hans Ahlefeldt, the Bernstorffs, Saint-Germain, Ove Høegh-Guldberg, General Heinrich Wilhelm von Huth and General Peter Elias von Gähler.
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One of Classen's patrons was Saint-Germain who was striving to improve Danish artillery.
Johan Christian Fabricius | Frederik Pohl | Johan Galtung | Frederik Magle | Frederik, Crown Prince of Denmark | Johan Petter Johansson | Johan Norberg | Johan Niclas Byström | Johan Museeuw | Johan Henric Kellgren | Johan de Witt | Johan Jeremiassen | Johan Gunnar Andersson | Johan Cruyff | Johan Bojer | Frederik van Eeden | Frederik de Groot | Nils Johan Berlin | Johan Wohlert | Johan Vande Lanotte | Johan Svendsen | Johan Reinhard | Johan Jakobsson | Johan Ferrier | Johan Falkberget | Johan de Meij | Johan Banér | Frederik Ruysch | Willem Frederik Hermans | Ulrik Frederik Gyldenløve |