Commissioned by Emperor Trajan although still inside the boundary of the Servian Wall .
Emperor Trajan is the complex of baths occupied space on the southern side of the Oppian Hill on the outskirts of what was then the main developed area of the city .
Commissioned by Emperor Trajan , the complex of baths occupied space on the southern side of the Oppian Hill on the outskirts of what was then the main developed area of the city , although still inside the boundary of the Servian Wall .