Decorated with or as if with banners; displaying banners or flags prominently.
From em- (in, covering) + banner (flag, standard) + -ed (past participle/adjective), creating an image of something covered in banners.
Medieval embannered castles and tournament grounds created stunning visual spectacles—the fabric of hundreds of banners rippling in the wind conveyed power and pageantry in a way that made the medieval elite visually distinct from common people.
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