Eudemus of Rhodes (Ευδημος) was an ancient Greek philosopher, who lived from ca. 370 until ca. 300 BC. He was the first historian of science. He was one of Aristotle's most important pupils, editing his teacher's work and making it more easily accessible.
Eudemus was born on the isle of Rhodos, but spent a large part of his life in Athens, where he studied philosophy at Aristotle's Peripatetic School. Eudemus's collaboration with Aristotle was long-lasting and close, and he was generally considered to be one of Aristotle's most brilliant pupils: he and Theophrastus of Lesbos were regularly called not Aristotle's "disciples", but his "companions" (`εταιροι).
It seems that Theophrastus was the greater genius of the two, continuing Aristotle's studies in a wide range of areas. Although Eudemus too conducted original research, his forte lay in systematizing Aristotle's philosophical legacy, and in a clever didactical presentation of his teacher's ideas. Later authors who wrote commentaries on Aristotle often could made good use of Eudemus's preliminary work. It is for this reason that, in spite of the fact that Eudemus's writings themselves are not extant, we know many citations and testimonia regarding his work, and are thus able to build up a picture of him and his work.
Aristotle, shortly before his death in 322, designated Theophrastus to be his successor as head of the Peripatetic School. Eudemus then returned to Rhodos, where he founded his own philosophical school, continued his own philosophical research, and went on editing Aristotle's work.
Historian of science
Eudemus was the first historian of science. At the insistence of Aristotle, he wrote histories of Greek mathematics and astronomy. Though only fragments of these have survived, included in the works of later authors, yet their value is immense. It is only because later authors used Eudemus's writings that we still are informed about the early history and development of Greek science. In his historical writings Eudemus showed how the purely practically oriented knowledge and skills that earlier peoples such as the Egyptians and the Babylonians had known, were by the Greeks given a theoretical basis, and built into a coherent and comprehensive philosophical building.
As regards his History of Arithmetics (’Αριθμητικη ‘ιστορια) we only have the tiniest bit of information: there is only one testimonium, saying that Eudemus mentions the discovery by the Pythagoreans that it is possible to connect musical intervals with integer numbers.
Eudemus's History of Geometry (Γεωμετρικη ‘ιστορια) is mentioned by many more writers, including Proclus, Simplicius, and Pappus. From them we know that the book treated the work by, among others, Thales of Miletus, the Pythagoreans, Oenopides of Chios, and Hippocrates of Chios. Among the topics Eudemus discussed were the discovery of geometrical theorems and constructions (systematized in Eudemus's days by Euclid in his Elements), and the classical problems of Greek geometry, such as the quadrature of the circle and the duplication of the cube.
We know quite a lot too about Eudemus's History of Astronomy (’Αστρολογικη ‘ιστορια), from sources such as Theon of Smyrna, Simplicius, Diogenes Laërtius, Clement of Alexandria, and others. Building upon those data we can reconstruct quite accurately the astronomical discoveries that were made in Greece between 600 and 350 BC, as well as the theories that were developed in that period regarding the earth, solar and lunar eclipses, the movements of the heavenly bodies, etcetera. Philosophers and astronomers treated by Eudemus include Thales, Anaximander, Anaximenes, Oenopides, Eudoxus, and others.
Two other historical works are attributed to Eudemus, but here his authorship is not certain. First, he is said to have written a History of Theology, that discussed the Babylonian, Egyptian, and Greek ideas regarding the origins of the universe. Secondly, he is said to have been the author of a History of Lindos (Lindos is a port on Rhodos).
To Eudemus is also ascribed a book with miraculous stories about animals and their humanlike properties (braveness, ethical sensitivity, and the like). However, as the character of this work does not at all fit in with the serious scientific approach that is apparent from Eudemus's other works, it is generally held that Eudemus of Rhodos cannot have been the author of this book.
Editor of Aristotle's work
Eudemus, Theophrastus, and other pupils of Aristotle took care that the intellectual heritage of their master after his death would remain accessible in a reliable form, by recording it in a long series of publications. These were based on Aristotle's writings, their own lecture notes, personal recollections, etcetera.
Thus one of Aristotle's writings is still called the Eudemian Ethics, probably because it was Eudemus who edited (though very lightly) this text. More important, Eudemus wrote a number of influential books that clarified Aristotle's works:
Eudemus's Physics (Φυσικα) was a compact, and more didactical version of Aristotle's homonymous work.
Eudemus wrote two or three books dealing with logics (Analytics and Categories (possibly the same book), and On discourse (Περι λεξεως)), which probably expounded Aristotle's ideas.
Finally, a geometrical work, On the angle (Περι γωνιας).
A comparison between the Eudemus fragments and their corresponding parts in the works of Aristotle shows that Eudemus was a gifted teacher: he systematizes subject matter, leaves out digressions that distract from the main theme, adds specific examples to illustrate abstract statements, formulates in catching phrases, and occasionally inserts a joke to keep the reader attentive.
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