Seen from higher, the temple of Isis and Serapis is tightly leaning against the great portico of Maleagre of the Sæpta Julia, on the right of the picture. This cult has been introduced into Rome since the IInd century and grows continuously despite the Senate’s edicts. In 58, 53, 50, 48 BC, its chapels and statues are destroyed, but in 43, after Cæsar’s death, the triumvirs accept it officially and have a temple erected on the State’s expenses. The last official resistance against the cult is dating to Tiberius. Caligula lets build this temple on the Campus Martius, the great temple of Isis Campensis.