Xavier Vives is a Spanish economist regarded as one of the main figures in the field of industrial organization and, more broadly, microeconomics. He is currently Chaired Professor of Regulation, Competition and Public Policies, and academic director of the Public-Private Sector Research Center at IESE Business School in Barcelona.
Xaviera Hollander is a Dutch former call girl, madam and author. She is best known for her best-selling memoir The Happy Hooker: My Own Story.
Xenarchus of Seleucia in Cilicia, was a Greek Peripatetic philosopher and grammarian. Xenarchus left home early, and devoted himself to the profession of teaching, first at Alexandria, afterwards at Athens, and last at Rome, where he enjoyed the friendship of Arius, and afterwards of Augustus; and he was still living, in old age and honour, when Strabo wrote. Xenarchus disagreed with Aristotle on many issues. He denied the existence of the aether, composing a treatise entitled Against the Fifth Element. He is also mentioned by Simplicius, by Julian the Apostate, and by Alexander of Aphrodisias.
Xeniades was a skeptical philosopher from Corinth, probably a follower of the pre-Socratic Xenophanes. There may have been two such persons, as he is referenced by Democritus c. 400 BC, though was also supposedly the purchaser of Diogenes the Cynic c. 350 BC, when he was captured by pirates and sold as a slave. Xeniades was supposed to have been the man who persuaded Monimus to become a follower of Diogenes, and was the source of his skeptical doctrines.
Xenocles (Ancient Greek: Ξενοκλῆς) was an ancient Greek tragedian. He won a victory at the Dionysia in 415 BC with the plays Oedipus, Lycaon, and Bacchae with the satyr play Athamas. Other plays by Xenocles include Licymnius, parodied by Aristophanes in The Clouds, and perhaps Myes. Aristophanes also refers negatively to Xenocles in the Thesmophoriazusae and Frogs.
Xenocrates of Chalcedon was a Greek philosopher, mathematician, and leader (scholarch) of the Platonic Academy from 339/8 to 314/3 BC. His teachings followed those of Plato, which he attempted to define more closely, often with mathematical elements. He distinguished three forms of being: the sensible, the intelligible, and a third compounded of the two, to which correspond respectively, sense, intellect and opinion. He considered unity and duality to be gods which rule the universe, and the soul a self-moving number. God pervades all things, and there are daemonical powers, intermediate between the divine and the mortal, which consist in conditions of the soul. He held that mathematical objects and the Platonic Ideas are identical, unlike Plato who distinguished them. In ethics, he taught that virtue produces happiness, but external goods can minister to it and enable it to effect its purpose.
Xenocrates a Greek physician of Aphrodisias in Cilicia, who must have lived about the middle of the 1st century, as he was probably a contemporary of Andromachus the Younger. Galen says that he lived in the second generation before himself. He wrote some pharmaceutical works, and is blamed by Galen for making use of disgusting remedies, for instance, human brains, flesh, liver, bone ash, urine, excrement, etc. One of his works was entitled On Useful Things from Living Beings. He is several times quoted by Galen, and also by Clement of Alexandria; Artemidorus; Pliny; Oribasius; Aëtius; and Alexander of Tralles. Besides some short fragments of his writings there is extant a synopsis of a work on marine creatures, preserved by Oribasius.
Xenophanes of Colophon was a Greek philosopher, theologian, poet, and critic of Homer from Ionia who travelled throughout the Greek-speaking world in early Classical Antiquity.
Xenophon of Athens was a Greek military leader, philosopher, and historian, born in Athens. At the age of 30, Xenophon was elected commander of one of the biggest Greek mercenary armies of the Achaemenid Empire, the Ten Thousand, that marched on and came close to capturing Babylon in 401 BC. As the military historian Theodore Ayrault Dodge wrote, "the centuries since have devised nothing to surpass the genius of this warrior". Xenophon established precedents for many logistical operations, and was among the first to describe strategic flanking maneuvers and feints in combat.
