Editing Gaius Caesar (section)

====Expedition in Arabia====
Sometime in the course of his time in the east, Gaius led an expedition into Arabia. Exactly where and for what purpose remains uncertain, though [[Pliny the Elder|Pliny]] mentioned it in connection with [[Aelius Gallus]]' exploits in [[South Arabia]].<ref>Pliny, ''Natural History'', [https://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.02.0137%3Abook%3D6%3Achapter%3D32 VI.32]</ref> The term "Arabia" is never defined, and the term was used loosely by Roman sources. Various reasons, such as an attempt by Rome to control the incense trade, have been suggested but never proven.<ref>{{harvnb|Young|2001|pp=91–93}}</ref> Juba II, former king of [[Mauretania]], accompanied Gaius to the east. In order to prepare Gaius for his encounter with the Arabs, Juba wrote him a treatise. According to Pliny, the young prince made it as far as the [[Gulf of Aqaba]]. It is certain that this expedition happened before his time in Armenia, and, referencing Gaius' cenotaph in Pisa, it is almost certain to have taken place during his consulship.<ref name=Bowersock56/>

Author and historian [[John Grainger]] places Gaius at the Gulf of Aqaba, or in [[Nabataea]]. It is known that the [[Nabataean Kingdom]] later became the province of [[Roman Arabia|Arabia]], and so, it might be that Gaius conducted his "Arabian expedition" to either support or to discipline the King of Nabataea, [[Aretas IV Philopatris|Aretas IV]].<ref name=Grainger117>{{harvnb|Grainger|2013|p=117}}</ref> This is probably evidenced by the continuation of coinage in the king's name after Gaius' consulship.<ref name=Bowersock56/>

[[Cassius Dio]], in a fragmentary notice,<ref name="LV.10a">Cassius Dio, ''Roman History'', [https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Cassius_Dio/55*.html#10a LV.10a]</ref> mentions trouble in Egypt which was suppressed by a tribune of the Praetorian Guard. It is very likely this man was part of Gaius' entourage, but other than that nothing is known of him.<ref name=Grainger117/>