Titus Flavius Clemens, also known as Clement of Alexandria (Κλήμης ὁ Ἀλεξανδρεύς; 150 – 215 AD), was a Christian theologian and philosopher who taught at the Catechetical School of Alexandria. Among his pupils were Origen and Alexander of Jerusalem. A convert to Christianity, he was an educated man who was familiar with classical Greek philosophy and literature. As his three major works demonstrate, Clement was influenced by Hellenistic philosophy to a greater extent than any other Christian thinker of his time, and in particular, by Plato and the Stoics. His secret works, which exist only in fragments, suggest that he was familiar with pre-Christian Jewish esotericism and Gnosticism as well. In one of his works he argued that Greek philosophy had its origin among non-Greeks, claiming that both Plato and Pythagoras were taught by Egyptian scholars.
Clement is usually regarded as a Church Father. He is venerated as a saint in Coptic Christianity, Eastern Catholicism, Ethiopian Christianity, and Anglicanism. He was revered in Western Catholicism until 1586, when his name was removed from the Roman Martyrology by Pope Sixtus V on the advice of Baronius. The Eastern Orthodox Church officially stopped any veneration of Clement of Alexandria in the 10th century. Nonetheless, he is still often referred to as "Saint Clement of Alexandria" by both Eastern Orthodox and Roman Catholic authors.
Neither Clement's birthdate or birthplace is known with any degree of certainty. It is speculated that he was born sometime around 150 AD. According to Epiphanius of Salamis, he was born in Athens, but there is also a tradition of an Alexandrian birth.
His parents were pagans and Clement was a convert to Christianity. In the Protrepticus he displays an extensive knowledge of Greek religion and mystery religions, which could only have arisen from the practice of his family's religion.
Having rejected paganism as a young man due to its perceived moral corruption, he travelled in Greece, Asia Minor, Palestine, and Egypt.