In addition to the construction of the Temple of the Sun, the only other significant building project in Rome during the era of the solder emperors was

Question

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The significant building project during the era of the soldier emperors, aside from the construction of the Temple of the Sun, was the construction of a new fortified wall circuit, known as the Aurelian Walls. This project was undertaken to defend Rome against external threats.

In Addition to the Construction of the Temple of the Sun