Claudius Balbillus, Tiberius. Praefectus Aegypti AD 55-59; games were held in Ephesus after 70 (Βαλβιλλεῖα; Balbilleîa) in his honour. Sen. Q Nat. 4,2,13 praises his erudition, therefore identified by Cichorius i.a. [2; 3; 9. 39] against  with the son of Thrasyllus, the astrologer of emperors Claudius (he comes to him in 41 as envoy of the Alexandrians to Rome), Nero and Vespasianus. His writings, addressed to a certain Hermogenes, were called Ἀστρολογούμενα (Astrologoúmena).
1 F. Cumont, CCAG VIII 4, 23…