Decorated or adorned with arras (a type of decorative tapestry or wall hanging).
From 'arras,' a type of tapestry from the town of Arras in France, plus the suffix '-ed' (having the quality of). Arras tapestries were extremely valuable in medieval and Renaissance Europe.
Medieval kings would show off wealth by hanging arras tapestries on their walls—they're expensive, take years to make, and literally insulate rooms from cold, so calling a room 'arrased' meant the owner was seriously wealthy and cultured.
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