The Letter of Petrus Peregrinus on the Magnet, A.D. 1269

In a time when most scholars merely recorded ancient lore, a French engineer named Petrus Peregrinus turned his curiosity toward the mysterious power of the lodestone. Writing from a siege camp in southern Italy in 1269, he sent a candid letter to a close friend, laying out observations that go far beyond the usual tales of attraction. He notes that magnets can both pull and push iron, that opposite poles behave differently, and even sketches how a rotating wheel might run on magnetic force alone. This early attempt to harness magnetism reads like a medieval laboratory notebook, full of sketches, measurements, and earnest speculation.

The letter weaves together centuries of classical references—from Lucretius to Albertus Magnus—with Peregrinus’s own hands‑on experiments, creating a lively dialogue between past wisdom and fresh insight. Listeners will hear how he devised a simple motor while fortifying a camp, and how his methodical description became the first systematic treatise on magnetic phenomena. Though the ideas are rooted in the thirteenth century, the sense of wonder and the drive to test nature’s hidden rules feel timeless.