Were Christians the first granted religious toleration by the Roman Emperor?

A:The Edict of tolerance issued by Emperor Galerius in 311 CE was certainly intended primarily for the benefit of Christianity, which had recently suffered under the 'Great Persecution'. However, it was also intended to benefit all religions, including Mithraism and Gnostic Christianity. Constantine reinterpreted this freedom such as to exclude these religions, as well as beginning to remove the ancient toleration of Judaism.