Theodōrus in Harpers Dictionary of Classical Antiquities (1898)

An eminent rhetorician of the age of Augustus, was a native of Gadara. He settled at Rhodes, where Tiberius, afterwards emperor, during his retirement (B.C. 6- A.D. 2) to that island, was one of his hearers (Sueton. Tib. 57). He also taught at Rome. Theodorus was the founder of a school of rhetoricians called "Theodorei."