Cecco d'Ascoli

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Cecco d’Ascoli — born Francesco degli Stabili, around 1269 near Ascoli Piceno — was an Italian astrologer, physician, and poet, and one of the rare scholars of his age to die at the stake for what he taught about the stars. Most learned men who held that the heavens govern earthly life were left in peace; Cecco was burned at Florence in 1327, and his case stands out for that reason alone.

He taught astrology and astronomy at the University of Bologna, where he held a chair, and at some point served as physician and astrologer at the Florentine court. His surviving technical work includes a commentary on the Sphaera of Johannes de Sacrobosco, the standard medieval textbook of the heavens — the kind of careful academic exposition that placed him squarely inside the university science of his day. Astrology, in that setting, was not sorcery but a recognised branch of natural philosophy, taught alongside medicine and read for the body’s health and the course of events.

What made Cecco different was how far he pushed the claim. He is best remembered for L’Acerba, an unfinished encyclopedic poem in vernacular terza rima that ranges across astronomy, natural science, and morals, and that takes open issue with Dante — disputing points of physics and cosmology against the Commedia, which was then circulating. Where much astrology held the stars to be signs, or causes only of the body and the world below, Cecco appears to have argued for a harder determinism: that the heavens shape human affairs in detail, and — in the reports that proved fatal — that even the life of Christ had unfolded under the governance of the stars, and that the powers of certain demons and the events of the Gospels could be read astrologically. The sources for the trial are partial, and how much of what was charged he actually held remains debated; but it was this collision between astral fate and Christian freedom that the Inquisition fixed on. He had already been censured at Bologna before the final proceedings at Florence sent him to the fire.

The historical record and the later legend pull apart here, as they do for the other learned astrologers of the period. Scholarship can establish a real university teacher whose astrology ran past the line his Church would tolerate; popular memory made him a magician and a rival genius to Dante, undone by his own boldness. What gives his case its weight is its rarity. The doctrine that the stars incline or even compel was widely taught and widely tolerated; in Cecco it was carried to a point where the institution that had housed such learning chose, this once, to kill the man who held it.

→ In the library: Plotinus — The Enneads (MacKenna): Are the Stars Causes?

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