I will investigate what you posted. Not familiar with the Saint or the story. .
St. Malachy, an Irish saint, died in the Middle Ages. Created a list of popes describing each by a couplet in Latin. The list expires with the current pope:
In persecutione extrema S.R.E. sedebit Petrus Romanus qui pascet oves in multis tribulationibus quibus transactis civitas septicollis diruetur, et Iudex tremedus iudicabit populum suum.
Finis.