Crinas (Crinias) of Marseilles was a 1st-century physician from Massilia (Marseille), contemporary of the Emperor Nero. He practiced medicine in Massilia, having mathematical and astrological knowledge. What we know about him comes from a few lines of Pliny the Elder in his Natural History, book XXIX, 5 (9).
Having heard of Thessalus of Tralles, who made a great reputation for himself in Rome by practicing the same kind of medicine as himself, Crinas left his hometown to establish himself in Rome to compete with him. Very quickly, by his superior astrology, he diminished the credit of Thessalos by taking away half of his clients.
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