Where does “potestat” come from?

potestat (Middle English) comes from Old French potestat, from Latin potestas, from Proto-Italic potistāts.

Ancestry of “potestat”, step by step

Step	Language	Word	Meaning
1	Old French	potestat	—
2	Latin	potestas	power, ability; mastery, control; authority,...
3	Proto-Italic	potistāts	—