and Babylon, probably as cultural predecessors of the Greeks. In the Life of Greece, Dicaearchus also stated that Euripides' Medea plagiarised the Medea play of the obscure tragedian Neophron. On Musical Contests () and On Dionysiac Contests () – These works discussed innovations in Greek music and drama. In On Dionysiac Contests, Dicaearchus probably also treated the story that, when competing at the Dionysia with the Oedipus Tyrannus, Sophocles was defeated by the tragedian Philocles, and that Aristophanes' Frogs was staged twice. In this work, Dicaearchus probably also stated that the third actor was introduced to Athenian tragedy by Sophocles. On Alcaeus () – This was a monograph on the Lesbian poet Alcaeus of Mitylene. Works on Homer and Euripides – Plutarch cites Dicaearchus alongside Aristotle and Heraclides Ponticus as men who wrote on Homer and Euripides. Dicaearchus' works were probably either monographs on these poets (like his work On Alcaeus) or belonged to problemata literature (both Aristotle and Heraclides Ponticus wrote works on Homeric problems). Among his geographical works may be mentioned: Circuit of the Earth () – This work was a geographical description of the world as it was then known. Dicaearchus divided the inhabited world into a northern and southern part, separated by a line running from the Strait of Gibraltar through Sicily to the Himalaya. He attempted to calculate the distances between various points on this line. In the Circuit of the Earth, Dicaearchus also treated the famous problem of the flooding of the Nile. Measurements of mountains – The Suda cites the work as Measurements of Mountains in the Peloponnese (), but other fragments show that Dicaearchus also measured mountains in Thessaly and on Rhodes. The work may have been part of his Circuit of the Earth. It was the earliest known attempt to measure the heights of various mountains by triangulation, for which he used a dioptra instrument. Dicaearchus' goal was to show that mountains were not as high as people believed and therefore did not impact the sphericity of the earth. Many of his results were later adopted by Eratosthenes. Of a political nature was: Tripolitikos () – A work which has been the subject of much dispute. It was probably a political dialogue (perhaps to be identified with the "political meeting" mentioned by Cicero) or a speech. Since the only extant fragment discusses the Spartan public meals, some scholars identify it with