For name-variants and a few biographical details (including citation to a biography published in 1963) see page 206 in: A Ziggelaar (1983), "The papal bull of 1582 promulgating a reform of the calendar", pages 201-239 in G.V. Coyne (ed.), The Gregorian Reform of the Calendar: Proceedings of the Vatican conference to commemorate its 400th anniversary (Vatican City: Specola Vaticana), 1983.