When in Dacia, do as the Romans?

What does Dacia have to do with Transylvania?

Dacia was the ancient area of Transylvania, and present day Romania, while I'm not entirely certain of the range to the present day Romania, (help is greatly needed) it is interesting to see how much the land was valued back then.

By the Turks, and Mongols, later, but also by the Roman Empire, who wanted Dacia to be a part of the territory to the East of Rome. After many battles, it became a province of the Roman Empire for a time.

According to some books, many of the Roman settlers left, some stayed, and for the most part, the Dacians remained there.