 In 1662 he became tutor to Michel Amelot de Gournay, whom he was to follow throughout his life, acting as secretary to his various missions as French ambassador to Venice, Portugal, Spain.In Venice (1682–1685) he started a famous collection of prints, drawings and paintings of Giorgione, Correggio, Rembrandt, Claude Lorrain, Rubens, Antoine Coypel, Jean-Baptiste Forest.He also acquired a taste for political intrigue using his travels ostensibly undertaken to study the European collections, as a buyer for Louis XIV, as cover for confidential missions - for example in Germany and Austria (1685) on behalf of Louis' minister, the marquis de Louvois.