What was the residence of the Pontifex Maximus called?

The residence of the Pontifex Maximus was called the Regia. This structure served as both a residence and a place of important religious functions for the chief priest of Rome. The Regia, located in the Roman Forum, was integral to the administration of religious duties and rituals, highlighting the significance of the Pontifex Maximus in Roman religion and governance.

The other options refer to different historical sites in Rome. The Tullianum, also known as the Mamertine Prison, was a place where prisoners were held, whereas the Domus Aurea was the opulent palace built by Emperor Nero. The Curia Hostilia served as the meeting place of the Senate. Each of these sites had its distinct function and significance, separate from the religious role associated with the Regia.