Aelius Caesar’s Pannonia coin in light of Hadrian’s succession politics. Pannonia province’s first securely identified personification is found on one of Aelius Caesar’s coin reverses, minted in 137. A.D. Its occurrence can be explained with that he was the newly designated heir to the throne, who was sent to govern both Pannonia Inferior and Superior. Its iconography that is based on Hadrian’s Concordia exercituum coin from 119–120/121, has a clear message, which calls upon the inhabitants of the empire and especially the soldiers to swear allegiance and loyalty to the new heir. It is interesting to see that both Trajan and Hadrian were in command of a large number of troops, when they came to power, just like Aelius. Putting the designated heir in charge of a considerable military strength was a well working way to secure that the throne was passed on to whom it was intended to. Pannonia’s further importance lay in its strategic geographical position, because it was a territory that was in charge of a large army, but was also located closest to Rome.