 In Rome Pirotta resided at the Angelicum College itself.After his two years of theology (1917–19), on 1 July 1919, he successfully set for his Lectorate exams with a dissertation entitled De Reali Distinctione inter Essentiam et Esse in Creatis (The Real Distinction between Essence and Existence in Created Being).Thereafter, he proceeded with his post-graduate studies in philosophy (1919–21).