According to the Christian father Origen, Celsus was a 2nd-century Greek philosopher and opponent of Early Christianity. He is known for his literary work, The True Word, which survives exclusively in Origen's quotations from it in Contra C...

Plotinus was a major philosopher in the ancient world and is widely considered the father of Neoplatonism. Much of our biographical information about him comes from Porphyry's preface to his edition of Plotinus' Enneads. His metaphysical wr...

Julian was Roman emperor from 361 to 363, as well as a notable philosopher and author in Greek. His rejection of Christianity, and his promotion of Neoplatonic Hellenism in its place, caused him to be remembered as Julian the Apostate by th...

Augustine of Hippo was an early Christian theologian and philosopher from Numidia whose writings influenced the development of Western Christianity and Western philosophy. He was the bishop of Hippo Regius in north Africa and is viewed as o...

Anicius Manlius Severinus Boëthius, commonly called Boethius, was a Roman senator, consul, magister officiorum, and philosopher of the early 6th century. He was born about a year after Odoacer deposed the last Western Roman Emperor and decl...

Thiruvalluvar, commonly known as Valluvar, was a celebrated Tamil poet and philosopher. He is best known as the author of Thirukkural, a collection of couplets on ethics, political and economical matters, and love. The text is considered an...

Al-Farabi was a renowned scientist and philosopher of the Islamic Golden Age. He was also a cosmologist, logician, and musician. Through his commentaries and treatises, Al-Farabi became well known among medieval Muslim intellectuals as "...

Alhazen (Ibn al-Haytham) was a Muslim scientist, polymath, mathematician, astronomer and philosopher, described in various sources as either Persian or Arab. He made significant contributions to the principles of optics, as well as to physi...

Anselm of Canterbury was a Benedictine monk, an Italian medieval philosopher, theologian, and church official who held the office of Archbishop of Canterbury from 1093 to 1109. Called the founder of scholasticism, he is famous as the origin...

Omar Khayyam was a Persian mathematician, astronomer, philosopher, and poet. He was born in Nishabur, in northeastern Iran, and spent most of his life near the court of the Karakhanid and Seljuq rulers in the period which witnessed the Firs...

Al-Ghazali known as Algazel to the western medieval world, born and died in Tus, in the Khorasan province of Persia (modern day Iran). He was a Muslim theologian, jurist, philosopher, and mystic of Persian origin and remains one of the most...

Peter Abelard (Latin: Petrus Abaelardus or Abailardus; French: Pierre Abélard) was a medieval French scholastic philosopher, theologian and preeminent logician. His love for, and affair with, Héloïse d'Argenteuil have become legendary. The...

Averroës is the Latinized form of Ibn Rushd, a mediæval Andalusian Muslim polymath. He wrote on logic, Aristotelian and Islamic philosophy, theology, the Maliki school of Islamic jurisprudence, psychology, political and Andalusian classical...

Saint Bonaventure was the eighth Minister General of the Order of Friars Minor, commonly called the Franciscans. He was a scholastic theologian and medieval philosopher, a contemporary of Thomas Aquinas, and a Cardinal Bishop of Albano. He...

Thomas Aquinas was an Italian Dominican priest of the Catholic Church, and an immensely influential philosopher and theologian in the tradition of scholasticism, known as Doctor Angelicus, Doctor Communis, or Doctor Universalis. He was the...