He came to Paris with good recommendations and came into the leading French art circles where he caught the attention and interest of Count Philippe de Caylus, renowned artist François Boucher, and fellow Swede Alexander Roslin (1718–1798).
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After his three-year studies in Paris he went on to Rome, where from late 1755 he came into the antique art enthusiast circle around Danish Johannes Wiedewelt, Italian Pompeo Batoni and German Anton Raphael Mengs.
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Arbien helped Mandelburg secure financial support by contacting Pilo in Copenhagen, who then interested the Danish Legation secretary to the French Court in Paris Justitsråd Joachim Wasserschlebe, foreign minister Count Johan Hartvig Ernst Bernstorff and Adam Gottlob Moltke, and finally through them King Frederick V of Denmark.
Edvard Munch | Edvard Grieg | Johan Christian Fabricius | Edvard Beneš | Johan Galtung | 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 | Nils Johan Berlin | Johan Wohlert | Johan Vande Lanotte | Johan Svendsen | Johan Reinhard | Johan Jakobsson | Johan Ferrier | Johan Falkberget | Johan de Meij | Johan Banér | Ole-Johan Dahl | Lars Johan Hierta | Lars Edvard Phragmén | Johan van Oldenbarnevelt | Johan Skytte Prize in Political Science |
With his enormous creative talent Clemens' reputation in Denmark grew, and he was in good company with his contemporaries Nikolaj Abraham Abildgaard, Johan Martin Preisler, Johan Edvard Mandelberg, Johannes Wiedewelt and Jens Juel.