The study of Roman religion as a topic worthy of scholarly inquiry in its own right – as opposed to being considered a farrago of quaint local traditions, folklore, and stray Etruscan influences (especially ritual) unsystematically presided over by imported Hellenic anthropomorphic deities – was established on firm foundations by Mommsen's study and explication of the Roman calendar in the first volume of the first edition of the Corpus Inscriptionum Latinarum (1863). Here Mommsen reconstructed the cycle of the Roman religious year by elucidating epigraphic fragments of ancient calendars with information scattered in our surviving literary sources. Mommsen's edition was followed, in due time, by a revised presentation in the second edition of CILi (1893) and by Georg Wissowa's magisterial handbook, Religion und Kultus der Römer (1st edn., 1905; 2nd edn., 1912), still a fundamental reference work supplemented and complemented, not replaced, by K. Latte's Römische Religionsgeschichte of 1960. At the time Wissowa was preparing a second edition of his handbook, another significant study of Roman religion founded on Mommsen's work appeared: Ludwig Deubner's discussion of the development of religion in early Rome in its own terms, not as a footnote to Greek religion.