Theodorus Lector

Theodorus Lector (, Theodoros Anagnostes; fl. 6th century AD) was a lector, or reader, at the Hagia Sophia in Constantinople during the early sixth century. He wrote two works of history; one is a collection of sources which relates events beginning in 313, during Constantine's early reign, down to 439, during the reign of Theodosius II. 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. The former work is important to scholars editing the authors quoted by Theodorus; the latter exists only in fragment and owes its importance more to the "scantiness of our information concerning the period it treats rather than its merits." The chronicle has not survived; excerpts exist in other chronicles, and it is also quoted in a tract by John of Damascus, and by the acts of the Second Council of Nicaea. 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. A critical edition based on all extant excerpts of the Church History was published by Polish scholars in 2020.

A fragment of his Historia, as preserved by Nikephoros Kallistos Xanthopoulos, records the earliest known Byzantine composers, the brothers Anthimos and Timokles.