The findings of Vermaseren and Essen also found there to be similarities to another Mithreaum in Ostia Antica, a harbor city 19 miles (30 kilometers) from Rome. The architectural analysis suggests that the Mithraeum under the Santa Prisca Church in Rome had undergone construction and was enlarged around the year 220 A.D. Similarities between the two Mithraic temples also suggest that those in the cult who had worked on the Mithraeum in Ostia had helped in the construction and painting of the Mithraeum in Santa Prisca.