'I am much obliged to you for the coin of Caligula found at Chichester; it is no small argument for the antiquity of that place; ...
[On Cogidubnus taking the name Tiberius Claudius, it doesn’t show he became part of the imperial family; refers to Scipio Maffei’s Antiquitates Galliae Selectae p. 105] where from a medal, he gives you these words, ΤΙΒΕΡΙΟΣ ΙΟΥΛΙΟΣ ΒΑΣΙΛΕΥΣ ΡΗΣΚΟΥΠΟΡΙΣ, circa caput regis diadematum. Here you see a foreign prince, a little before the time of our Cogidubnus, thought it was no disgrace to assume the emperor’s name, nor does it appear he was any more than a friend and an ally, and not dopted into the imperial family. In the same learned author, p. 13, you have a medal of Λ ΑΝΤΩΝΙΟΥ ΤΑΡΚΟΝΔΙΜΟΤΟΥ ΒΑΣΙΛΕΩΣ king of the Upper Cilicia, still earlier, who took the name of his benefactor ΑΝΤΝΙΟΣ, in honour of Anthony.... I will add two more coins with a compliment upon them, by which, and what has been said, you will see it was continued for many years, even from the time of Augustus to the reign of Gordian, and was a mark of gratitude to the emperors, that they acknowledged them for their patrons and benefactors. In Spanheim de usu et praest. num. T.I, p. 535 and 537, is a medal with Severus’s head on one side, on the other that of Abgarus, king of Edessa, with ΒΑΣΛΑΙΑ-ΣΕΠ ΑΒΓΑΡΟΣ Rex Lucius Aelius Septimius Abgarus, where he takes the names of two different emperors, Lucius Aelius and Septimius, as Severus was called; to both of whom he must have had obligations. The second shews a head with a tiara, and ΑΒΓΑΡΟΣ ΒΑΣΙΛΕΥΣ, and the reverse Gordian with a globe in his left-hand, and Abgarus touching his tiara with his right, ΑΥΓ ΓΟΡΔΙΑΝΟΣ ΑΒΓΑΡΟΣ ΒΑΣΙΛΕΥΣ, which needs no comment from what I have already said; but, for further satisfaction, you may, if you please, consult Mons. Spanheim as above, and Mr Wise’s Epistle ad Joannem Masson de Nummo Abgari Regis.'
(Nichols 1781-1790, pp. 393-8; Burnett 2020b, p. 1662)