in the
Bibliothèque Mazarine From 1615 until 1622, Peiresc again visited Paris with du Vair. He then returned to Provence to serve as senator of the sovereign court. He became a patron of science and art, studied
fossils, and supported the astronomer
Pierre Gassendi from 1634 to 1637.
Virginio Cesarini proposed him for membership of the
Accademia dei Lincei in 1621, but it is not certain whether he joined. Peiresc's position as a great intellectual at the time of the
Scientific Revolution has led to his being called a "Prince of the Republic of Letters". He was also a noted politician in his home region, and a tireless letter-writer (10,000 of his letters survive, and he was in constant correspondence with
François de Malherbe,
Hugo Grotius, the
brothers Dupuy,
Alphonse-Louis du Plessis de Richelieu, and with his great friend
Rubens. His correspondence to Malherbe throws light on the personality of Malherbe's troubled son Marc-Antoine Malherbe. Peiresc became one of the first admirers and supporters of Caravaggio in France. He first discovered Caravaggio's works in the
Contarelli chapel in Rome in 1600 when he was only 20 years old. In his hometown, he gathered around him a sort of 'caravaggesque workshop of Southern France' with artists including Flemish artist
Louis Finson,
Martin Hermann Faber,
Trophime Bigot and other painters. He promoted the Caravaggesque style by arranging commissions for these artists. He was instrumental in obtaining a number of commissions for Finson, including for history paintings and portraits. Finson also painted a
portrait of de Peyresc. Peiresc was an avid art collector and relied on Finson's contacts in Italy to acquire two works of Caravaggio from the Pasqualini family of Rome. Peiresc's house in Aix-en-Provence was a veritable museum, and held a mix of antique sculptures, modern paintings, medals, books and gardens with exotic plants. He acquired the Byzantine
Barberini ivory (it is not known how or from whom) and offered it to
Francesco Barberini: the work is now in the
Louvre. He had the Codex Luxemburgensis, the surviving Carolingian copy of the
Chronography of 354 in his possession for many years; after his death it disappeared. He owned over 18,000 coins and medals, and was also an archaeologist, amateur artist, historian (he demonstrated that Julius
Caesar's invasion of Britain set out not from
Calais but from
St Omer), Egyptologist, botanist, zoologist (studying chameleons, crocodiles, the elephant and the alzaron, a sort of
Nubian gazelle with a bull-like head, now disappeared), physiologist, geographer (put on the project of linking Aix to Marseilles), and ecologist. on 26 November 1610 ==Astronomer==