He was raised in the atmosphere of a scholarly household, familiar with Greek, ancient geography, and Arabic from an early age. In 1641, he undertook a European tour, in which he visited England, France and Italy (notably Florence), making the acquaintance of scholars of the elder generation such as James Ussher and Hugo Grotius and beginning his lifelong collecting of manuscripts and books before he returned to Amsterdam in 1644 to take up a position as city librarian.