Here's a question for George Knysh:
I know
http://en.wikipedia.org/wiki/Tiberius_Julius_Aspurgus
is supposed to have received the name Tiberius Julius upon being made Roman citizens, but why would
http://en.wikipedia.org/wiki/Tiberius_Julius_Rhoemetalces
http://en.wikipedia.org/wiki/Tiberius_Julius_Synges
http://en.wikipedia.org/wiki/Tiberius_Julius_Mithridates
http://en.wikipedia.org/wiki/Tiberius_Julius_Ininthimeus
etc keep that name? Being a Roman citizen could hardly have enhanced their legitimacy as Bosporan rulers.
****GK: The usual view is that Bosporan rulers retained the name "Tiberius Julius" to underscore their Roman connection esp. at a time when this was a very valuable commodity. I'm not familiar enough with Bosporan numismatics to know whether the "barbarian interlopers" of the 3rd c. (during the Gothic deluge) kept up the label. Apparently much later, in Hunnic times, there was a Hun client king of Bosporus who kept the "Tiberius Iulius" title.
A much later oddity. I once wrote an article about the mysterious "Slavic tribes" of the "Ulichi Tivertsi" mentioned in Nestor's Primary Chronicle before 944 CE, and argued that this could have been an idea based on the discovery of a "Tiberius Iulius" inscription on material the writer or his informant had discovered in the ruined Scythian cities of the Lower Dnipro, which was, at the time of Tiberius Iulius Sauromates (beg. of 3rd c.) subject to the Bosporans, and from
which the Kyivan rulers of the 11th century hauled stones for some of their own buildings...*****