Pope Zachary is regarded as a capable administrator and a skillful and subtle diplomat in a dangerous time. And "Forbade the traffic of slaves in rome"

Pope Zachary (Latin: Zacharias; 679 – March 752) was the bishop of Rome from December 741 to his death. He was the last pope of the Byzantine Papacy. ( Hive account@dan )

Zachary built the original church of Santa Maria sopra Minerva, forbade the traffic of slaves in Rome, negotiated peace with the Lombards, and sanctioned Pepin the Short's usurpation of the Frankis...

https://en.m.wikipedia.org/wiki/Pope_Zachary

Hah