*** A Royal Affair This Danish historical drama about a mad 18th-century king, his wife, and her lover is one of the stodgier entries in the Oscar-season costume parade but also one of the more straightforwardly enjoyable: a crowned-heads soap opera that balances effectively between pomp and melodramatic circumstance. With Alicia Vikander and Mads Mikkelsen. In Danish, with subtitles. (137 min., R) (Ty Burr)
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