Tribunal

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late Middle English (denoting a seat for judges): from Old French, or from Latin tribunal ‘raised platform provided for magistrate's seats’, from tribunus (see tribune1). tribunal (sense 1 of the noun) dates from the early 20th century.

wiktionary

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From Old French tribunal, from Latin tribūnal(“tribunal”)

etymonline

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tribunal (n.)

early 15c., "a judgment seat," from Old French tribunal "justice seat, judgment seat" (13c.) and directly from Latin tribunal "platform for the seat of magistrates, elevation, embankment," from tribunus "official in ancient Rome, magistrate," literally "head of a tribe" (see tribune). Hence, "a court of justice or judicial assembly" (1580s).