Subpoena

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late Middle English (as a noun): from Latin sub poena ‘under penalty’ (the first words of the writ). Use as a verb dates from the mid 17th century.

wiktionary

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First attested with this spelling in 1623 C.E., from earlier subpena, from Middle English sub pena, from Medieval Latin: sub(“under”) and poena(“penalty”), the beginning of the original subpoena used in the Court of Chancery.

etymonline

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subpoena (n.)

early 15c., sub pena, from Medieval Latin sub poena "under penalty," the first words of the writ commanding the presence of someone under penalty of failure, from Latin sub "under" (see sub-) + poena, ablative of poena "penalty" (see penal). The verb is attested from 1630s.