The Book of Saints. London: A & C Black, 1921.
Watkins, Dom Basil, ed. The Book of Saints: A Comprehensive Biographical Dictionary. London; Oxford; New York; New Delhi; Sydney: Bloomsbury T&T Clark: An Imprint of Bloomsbury Publishing Plc, 2016.
Is there a reason that these are indexed only by headword and not by date? Most of the saint resources have both indexes.