Where does “enprisoné” come from?

enprisoné (Old French) comes from Old French -é, from Latin -a, from Proto-Italic -ā, from Proto-Indo-European -éh₂.

Ancestry of “enprisoné”, step by step

StepLanguageWordMeaning
1Old French-éused to form past participles of regular -er...
2Latin-asuffixed to the roots of verbs, forms agent...
3Proto-Italic-āForms masculine agent nouns from prefixed or compounded bases
4Proto-Indo-European-éh₂—
Every word from Proto-Indo-European -éh₂ →Every word from Latin -a →Every word from Old French -é →