Ulphilas, [142]
Uncleanliness, pious, [206]
Underworld, Gods of, [33], [56], [57]
Unitarianism, [54], [102], [104], [195], [268], [275], [277], [281], [287], [290], [301], [313]. See Arianism
United States, religion in, [264], [295], [300]–301, [317]
Universities, rise of, [248]
Urania, [54]
Urban II (Pope), [217]