G'day everyone
"Trajan's conquests in the east proved impossible to hold, and his successor Hadrian (117-138) immediately pulled the frontier back to the Euphrates, although Armenia remained a client state. The following Pax Romana lasted until the murder of Commodus, the last adopted Emperor. The ensuing civil war (193-97) was won by Severus, whose dynasty maintained stability until 235. The coinage was repeatedly debased from about 170 onwards. In 212 all free men in the Empire were made citizens, an attempt to increase its tax base. With economic decline came political instability: in the half century after 235, there were 15 Emperors, most ruling only a few years. At the same time, Rome's enemies had become more powerful. In the east, the Parthians had been replaced in 226 by the Sassanid Persians, who sought to restore the glory of the Persian Empire 700 years before. They sacked Antioch in 253 and took the Emperor Valerian prisoner at Edessa in 260. Simultaneously, Germans raided deep into the Empire, reaching the Mediterranean at several points. The Empire's impotence prompted regional commanders to seize control in the worst affected areas. In the west, Postumus founded a Gallic Empire in 260, including Spain and Britain. In the east, the semi-independent trading city of Palmyra became the centre for resistance. Its ruler, Odenathus beat back the Persians and even sacked their capital Ctephiston. On his death in 267, his more ambitious widow, Zenobia, took power, and had by 269 conquered Roman Syria, Palestine and Egypt." -via The Roman Empire: 18 centuries in 19 maps.
The Roman Empire is trembling. It seems as if nothing can stop the downhill slide. If you were the ruler of a nation on Rome's borders (you chose which one), what do you do? Will you ally yourself with Rome, or will you help it on it's downward fall? And if you were the Emperor of the Romans, what would you do to help check the decline?