318 THE LATE MIDDLE AGES
pretty good rendition. What medieval “scientists” discovered were individual
truths or laws, whether in the areas of biology, chemistry, medicine, or whatever,
but the implication was that these discrete discoveries were merely parts of a larger
conjectured whole, a supreme blueprint that structured and balanced the cosmos.
The great “scientists” of the thirteenth and early fourteenth centuries made im-
portant individual discoveries and helped to promote the notion of the Grand
Design of the universe. This notion was to be the dominant Western attitude until
the troubling scientific dissolution of the early modern period.
The catalog of achievements in medieval science and technology is impressive.
The fields of anatomy, astronomy, botany, chemistry, geography, kinetics, linguis-
tics, magnetism, medicine, oceanography, optics, pharmacology, and zoology, to
name only a few, all enjoyed significant advances in their theoretical understand-
ing and practical application. At the level of technology, medieval engineers and
inventors developed eyeglasses, astrolabes, mechanical clocks, and magnetic com-
passes. It is difficult to answer the question “what did people in the Middle Ages
really know?” in terms of science, because there is no easy way to tell how widely
spread any given bit of knowledge might have been. In terms of astronomy and
cosmology, for example, almost every university-educated person in the thirteenth
century knew that the earth was round, but the majority of town dwellers and
rural workers probably did not. The prevailing popular cosmological model pos-
ited an immobile earth at the center of the universe, with all the planets and non-
fixed stars revolving around it in concentric circular orbits; but the theory of a
rotating earth was also extremely well known (it simply was not regarded as
proven). Medical science was hampered by cultural and ecclesiastical restraints on
dissection, although by the thirteenth century the leading physicians at schools
like the University of Montpellier were known to perform occasional dissections.
Figures like Arnau de Vilanova (d. 1311) wrote numerous treatises on the various
organs and their functions.
The two most important scientific figures of the thirteenth century were both
Englishmen: Robert Grosseteste (1168–1253), the first Chancellor of Oxford Uni-
versity, and Roger Bacon (1214–1292), who was one of the first, and certainly one
of the most outspoken, champions of the experimental method as the key to ad-
vancing scientific knowledge.
Grosseteste was born into a poor Suffolk family and received an excellent
education through England’s network of provincial patronage, rather than through
formal schooling. Wealthy patrons eager to show their sophistication frequently
retained scholars on their estates, providing them with libraries, equipment, and
above all the leisure time needed to educate themselves and each other. Grosseteste
was fortunate enough to receive such patronage and enjoy the company of other
self-taught scholars. His first big break came when he entered the household of
the bishop of Hereford, under whose guidance he added a strong foundational
knowledge of law and medicine to his already strong background in science. Ul-
timately, Grosseteste went on to the University of Paris to earn his degree in the-
ology; sometime around 1214 he returned to Oxford and took up residence as
University Chancellor, a post he held for about a decade. He lectured, broadly and
brilliantly, on topics as varied as astronomy, linguistics, music, and optics, and
earned a reputation as a preacher as well. Like many self-taught people who had
to struggle for years for his education, he had little patience with students who
did not take their studies seriously. Increasingly drawn to the Franciscans whom
he found to be consistently the best scholars at the university, he devoted himself
to preaching and lecturing to the friar-scholars about five years after arriving in