On the road at the moment, hence the shortness of the thread, but wanted to share this recent pick up of a not so well known once future heir of the Roman Empire..
Phrygia, Laodikeia. Gaius Caesar, grandson of Augustus. AE 15mm (3.53 gm). Struck circa 5 AD under the magistrate Antonius Polemon Philopatris.
Obv.: ΓΑΙΟΣ ΚΑΙΣΑΡ (GAIOS KAISAR), bare head right.
Rev.: Eagle with spread wings between two monograms ΠΟΛΕ (left),ΦΙΛΟΠΑΤ (right),("Polemon" and "Philopatris"). ΛΑΟΔΙΚΕΩΝ (LAODIKEON) below. RPC I 2900; BMC 154. VF.

His mother was "Julia the Elder" daughter of Augustus and his father was the great Roman General "Marcus Agrippa"..
Gaius and his younger brother Lucius were both adopted by Augustus as his sons and joint-heirs to the Empire.Tragically they would both die young, Lucius of an unknown illness in Massalia (20th August AD 2) whilst travelling to Hispania and only 18 months later, Gaius of a wound incurred whilst in a peace treaty with Rebel leader Abbadon in the city of Artagira Armenia on 9th September AD 2 but didn't die until 21st February AD 4...Interestingly Tacitus and Cassius Dio both claim that possibly Livia, their step grandmother, had a hand in their demise wanting her own son Tiberius to become the next heir, "Food for thought"!.....Paul