The Colosseum or coliseum, originally the Flavian Amphitheatre is an elliptical amphitheatre in the centre of the city of Rome, Italy, the largest ever built in the Roman Empire. It is one of the greatest works of Roman architecture and engineering.
Occupying a site just east of the Roman Forum, its construction started between 70 and 72 A.D. under the emperor Vespasian and was completed in 80 A.D. under Titus, with further modifications being made during Domitian’s reign.
I wonder what is the basic sentence of “Occupying a site just east of the Roman Forum”.
The basic sentence is "the emperor Vespasian occupied a site just east of the Roman Forum.", right?
I don’t know what is the subject of “Occupying”.
Is it possible to say "Occupyied a site just east of the Roman Forum" and the subject is "its constructions".?