The Dogma of the Immaculate ConceptionIn The Dogma of the Immaculate Conception: History and Significance (University of Notre Dame Press, 1958; reissued 2016), thirteen European and American theologians treat the historical development and theological significance of a major Roman Catholic doctrine. Edward Dennis OConnor, C. S. C., a specialist in mediaeval theology, notes in his preface that the subject of the Virgin Mary's Immaculate Conception was first discussed about the year 1100.