IIRC, there was some random number representing how civilized your province is and only way to boost it was to have more civilized neighbours/trading partners in that particular province. If it reached 50% you could start colonizing neighbouring barbarian province providing you triggered them to raise earlier and they still haven't regenerated. It was pain in the ass to spark, but snowballed easily, which only added to ridiculous blob gameplay.
It also meant that if you wanted an early start as some backwater Germanic tribes or some other Picts, then once you collected all the available lands around you had to pretty much wait for Romans to come to you and slaughter you mercilessly.
It also meant that if you wanted an early start as some backwater Germanic tribes or some other Picts, then once you collected all the available lands around you had to pretty much wait for Romans to come to you and slaughter you mercilessly.