What emperor of Rome added land north of FYROM and east of Syria to Rome?

The emperor Trajan conquered the Kingdom of Dacia (part of modern Romania) which was north of Moesia Superior (which covered present day central and southern Serbia and the northern part of the Former Yugoslav Republic of Macedonia) and Moesia Inferior (which covered northern modern Bulgaria andRomanian Dobrudja, the part of Romania between the coast of the Black Sea and the River Danube). Trajan also took Mesopotamia (northern Iraq) from the Persians. His successor Hadrian gave it back to the Persians, who were the only military power which matched that of Rome