Established as a denizen; having been granted denizen status or recognized as an inhabitant.
From denizen + -ed (past participle/adjectival suffix). The -ed ending here doesn't indicate a past action but rather a state or condition resulting from having been denizened.
Using 'denizened' as an adjective is rare and archaic—it shows how English sometimes takes nouns and creates adjectives to describe a state, even if the result sounds a bit unusual.
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