Treasury

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Middle English: from Old French tresorie (see treasure).

wiktionary

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From Middle English tresorie, from Old French tresorie, from tresor(“treasure”), from Latin thēsaurus(“treasure”), from Ancient Greek θησαυρός(thēsaurós, “treasure house”). Displaced native Old English māþmhūs.

etymonline

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treasury (n.)

c. 1300, "room for treasure," from Old French tresorie "treasury" (11c.), from tresor (see treasure (n.)). Meaning "department of state that controls public revenue" is recorded from late 14c. An Old English word for "room for treasure" was maðm-hus and for "treasury," feo-hus (see fee).