Where does “potestat” come from?

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

Ancestry of “potestat”, step by step

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

potestat — Etymology, Origin & Word History | Etymology Explorer