Domitian was a firm believer in traditional Roman religion

Domitian was a firm believer in traditional Roman religion, and he personally ensured that ancient practices and morality were followed throughout his reign. Domitian promoted connections with the principal deity Jupiter in order to justify the divine nature of the Flavian rule, probably most notably through the spectacular reconstruction of the Temple of Jupiter on Capitoline Hill. A tiny chapel dedicated to Jupiter Conservator was also built near the house where Domitian had sought refuge on December 20, 1969. Later in his reign, he replaced it with a larger structure dedicated to Jupiter Custos. Minerva, on the other hand, was the deity he most fervently revered. He not only kept a personal shrine to her in his bedroom, but she also appeared on his currency on four different recorded reverse kinds, and he formed a legion in her honor, Legio I Minerva.

Domitian also resurrected imperial worship, which had fallen out of favor under Vespasian. His first act as emperor was the deification of his brother Titus, which was significant. His young son and niece, Julia Flavia, were also enrolled among the gods after their deaths. He built the Temple of Vespasian and Titus, a temple dedicated to the adoration of his deified father and brother, and erected a dynastic mausoleum on the site of Vespasian's former house on the Quirinal. To commemorate the Flavian family's military victories, he authorized the construction of the Templum Divorum and the Templum Fortuna Redux, as well as the completion of the Arch of Titus.