Note 4 — Chapter V
Reading edition
Collaterally, of course: Gregory XIII. (Buoncompagni), 1572-1585; and Gregory XV. (Ludovisi), 1621-1623. I interested Don Andrea by telling him that Gregory XIII. (reformer of the Julian Calendar and builder of the Quirinal) was probably the last Pope officially prayed for at Oxford, and that in his own college chapel. Mass certainly continued to be celebrated in Merton Chapel well into the Pontificate of Gregory XIII.