Presumably you mean Transylvania, in present day Romania. It was taken over by the emperor Trajan when he in the second of his two Dacian Wars against the Kingdom of Dacia (105-106) when he took over this kingdom, which covered much of today's Romania.
It is an error; in the antiquity Romans invaded the territory of the today Romania.
Yes, Most Romans, actually settled in Romania.
danube
Romans invaded the ancient Dacia in 101.
1. The old name was Dacia.2. The Romans did not use the name Romania for the conquered territory.
There is no definitive answer to this as you do not ask where or what they took over
most of Europe
The name in antiquity was Dacia.
The invasion was at the beginning of the first century a.d.
The Romans took over the Italian peninsula in the 4th and 3rd centuries BC.
In 267 B.C.