Pope Innocent I (A.D. 402–417) in his famous decretal established that on the Sabbath “one should not absolutely celebrate the sacraments” (Ad Decentium, Epist. 25, 4, 7, PL 20, 550); Sozomen (ca. A.D. 440) reports that no religious assemblies were held on the Sabbath in Rome or at Alexandria (Historia ecclesiastica 7, 19); cf. Socrates, Historia ecclesiastica 5, 22.