One "Reunion" Council and Two...

ecumenical councils? What did the decrees of Florence really say about the papacy? Something for me to look up, presumably in Denzinger.

From a comment:

I would advise those who have difficulty with Pope Francis’s teaching on the death penalty to follow the guidance of the CDF given in Donum Veritatis, 27-31. Some of Dr. Peters’ comments about the ordinary papal magisterium need clarification because they could be interpreted as challenging the universal ordinary teaching authority of the Roman Pontiff, which is affirmed by three ecumenical councils: Florence (D-H, 1307); Vatican I (D-H, 3064), and Vatican II (Lumen Gentium, 22 and 25).