Final answer:
The predecessor for the Mausoleum of Constanza is the Colosseum in Rome.
Step-by-step explanation:
The predecessor for the Mausoleum of Constanza is the Colosseum in Rome. The Mausoleum of Constanza was inspired by the architecture of the Colosseum, which was a massive amphitheater built during the Roman Empire. Both structures showcased grandeur and impressive construction techniques of their respective time periods.
While constructions such as the Colosseum were monumental in their own right, they served a different purpose and did not have the architectural impact on the Mausoleum of Constanza as the Pantheon did.