Igreja de São João do Souto, a medieval parish church documented in the twelfth century, was the place where Francisco Sanches was baptized in Braga on 25 July 1551. Born into a family of converted Jewish origin, Sanches later became one of the most important physicians and philosophers of the Iberian Renaissance.

Francisco Sanches

Francisco Sanches is best known for Quod nihil scitur (That Nothing Is Known), published in 1581, one of the key works of Renaissance skepticism. In it, he challenged scholastic authority and questioned the possibility of certainty based solely on inherited systems of knowledge. His work placed doubt, observation, and experience at the center of intellectual inquiry. Beyond philosophy, he also built an important medical career in France, especially in Toulouse, where he taught and practiced medicine.

New Christian Background

His biography belongs to the difficult world of sixteenth-century Iberia, where families of Jewish descent lived under conversion, pressure, and unstable promises of tolerance. Baptism did not erase suspicion, and incorporation into Christian society did not guarantee security. Francisco Sanches emerged from that world of New Christian vulnerability, even though his later career unfolded far beyond Braga and Portugal.