The Early Church Era · c. 150–400 CE · Alexandria, Egypt
You can sit down with this tradition now.
Alexandria was the ancient world's great city of libraries and lecture halls, and Christianity there took the same shape: a school. Teachers received enquirers, catechumens preparing for baptism, and educated pagans curious about this new philosophy, and walked them through Scripture as a text with a surface and a depth: the letter first, then the moral sense, then the spiritual meaning that opens onto the Logos himself.
Clement wrote for cultivated Greeks who wanted to know whether a Christian could keep his learning. Origen, who succeeded him, wrote commentaries across most of Scripture and produced the Hexapla, a six-column parallel edition of the Old Testament assembled to see what the Hebrew actually said — before falling out with his bishop and moving his teaching to Caesarea around 231. Historians still argue about how formal the whole thing was — whether Alexandria had one continuous institution with a succession of appointed heads, as Eusebius later described it, or a looser sequence of private Christian schools whose teachers happened to be remembered together. That tidy succession comes almost entirely from Eusebius: Clement's own writings never once describe a formal school that he headed.
The allegorical way of reading Scripture is this tradition's best-known signature, but it was never uncontested even at home. Nepos, a bishop out in the Egyptian countryside at Arsinoe, wrote a book refuting the allegorists and won real support for a plainer, literal reading — until Dionysius, by then bishop of Alexandria, spent three days in patient public conversation with Nepos's own community and brought them back around.