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Latin word potestas comes from Latin sum ((copulative) I am, exist, have (with dative).), Latin -ius, Proto-Indo-European *pótis (Husband. Master, ruler.)
sum (Latin)
(copulative) I am, exist, have (with dative).
-ius (Latin)
Genitive suffix for some irregular pronouns. Forming adjectives from nouns.
*pótis (Proto-Indo-European)
Husband. Master, ruler.
*potis (Proto-Italic)
potis (Latin)
Able, capable, possible.
posse (Latin)
(post-Classical) force, body of men. (scholastic Latin) potentiality, capability of being. Power, ability "to be able (to)".
potestas (Latin)
(of a word) meaning. Authority, jurisdiction. Dominion, political power. Mastery, control. Possibility, opportunity. Power, ability. Right, legal power.