Answer: Greek
Step-by-step explanation:
The ancient Greeks had a profound influence on the Romans such that the Romans adopted a lot of Greek practices and adapted it to their nation.
Just looking at Roman architecture and even religion makes it quite evident with the Romans having similar structures and gods to the Greeks.
The knowledge and practices did not stop at architecture and religion however but extended to other forms such as math, science and technology such that some historians in reference to the adage that Rome was not built in a day say instead that the Greeks did not build Rome in a day.