Trajan, the Imperator
Historia Romana (C. Luteti, 1998, Modena University Press)
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The real golden age of Rome started when Domitian was overthrown and Trajan, a young general, commandant of the XX Valeria Victrix in Hibernia, was selected by a council of generals, and the Senate. Trajan, was a bit of a dark horse in the pool of candidates, as a young general, born in Hispania, spent time as a regular soldier, climbed the ranks and achieved the command of a legion.
He was also noted for several other things, the improvement of Hibernian roads, the establishment of farms, industry and mining across the isle, as well as instuting a small system of welfare for the poorest of the poor.
All were needed across the Empire at the assassination of Domitian, the dirt poor became poorer, the Dacians were kicking up stream, as well as Caledonian and Hibernian rebels. Rome was flooded with immigrant shantytowns of British, Thracian and Pannonian refugees.
Trajan first act as imperator was to finish what he started in Hibernia, crushing the revolt with cunning tactics and the help of client kings.
He also incouraged trade through the region, as commodities such as salt, iron and gold was to be found there.
Western Britain enjoyed this relative prosperity to, ports were built up, and citizens became rich, thanks to Rome.
This new-found, favorable opinion of Rome allowed the local legion to move itself to Caledonia with the IX Hispania, solving the Caledonian problem.
Trajan's next task was Dacia.
Crossing the Danube in 99 AD, Trajan went into Dacia with three legions. As typical Roman strategy[1], Trajan and his legions barged strait for the enemy capital, knocking out the defensive force in the way and taking the country.
But Dacia was different, for the 20 years, guerilla fighting would rage off and on, and by the beginning of Hadrian's reign, it was let go.
The next policy Trajan began was "Don't ask, Don't tell" [2], because of the ongoing issue with Christians. It was simple, even if you though somebody was Christian, you didn't ask, and they didn't have to tell. It was the first step on the path to the legalization of Christianity 40 years later.
Trajan also enriched the power of the senate, slightly but enough to actually have them make a difference in Roman politics.
The last thing Trajan did, in his early years was reinstating the Emperor Titus's policy of free speech.
It can be said that these progressive reforms lead to the Roman Empire surviving over a hundred years past her due date.
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[1] This was a very common late first and early second century military strategy.
[2] Trajan and Hadrian had a similar policy in our timeline, and actually called it that, or something similar.