Theodorus Lector

The other is Theodorus' own work, retelling events from the death of Theodosius II in 450 to the beginning of Justin I's reign in 518.

"[1] While a lector at Hagia Sophia, Theodorus collected the works of the fifth-century historians Socrates Scholasticus, Sozomen, and Theodoret of Cyrrhus to create a chronicle of church history from Constantine to Theodosius II.

Theodorus later continued his chronicle, using other available sources to write his Church History (Ἐκκλησιαστικὴ Ἱστορία) from the death of Theodosius II down to 518.

The date of composition is not known, though it was probably finished before 543, as it can be conjectured that Theodorus would not have spoken of the "holy memory" of Theodoret following the onset of the Three-Chapter Controversy.

It is believed that a badly damaged manuscript of this work survives in the Library of St. Mark's in Venice, however no scholarly research has yet been done into it.

An artist's view of Constantinople in Byzantine times
Theodorus likely witnessed the destruction of the Hagia Sophia during the Nika riots in 532. He had previously been a reader at the basilica. Shown here are the remains of sculpture work adorning the old church as Theodorus knew it.