Excellent, short biography:
St. Pius V: 1566-1572: His Life, Times, Virtues and Miracles in the Aftermath of the Protestant Revolt (https://isidore.co/calibre/browse/book/6088) with a foreword by Cdl. Ottaviani
Happy feast of Pope St. Pius V, O.P.!
Happy belated feast of St. Pius V!