Two entries with the name Oswald.

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Oswald

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A nobleman at the court of Aurelius Ambrosius.

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Source
The Birth of Merlin, or the Childe Hath Found His Father | Attributed to William Shakespeare and William Rowley, 1662

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Oswald

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The Saxon king of Kent in Dryden’s King Arthur. He is named as Hengist’s son, taking the place of Octa in the chronicles.

Once Arthur’s ally against the Picts, he went to war with Arthur over Britain and over Emmeline, the daughter of the Duke of Cornwall. Arthur won the war, but Oswald and his sorcerer Osmond kidnapped Emmeline. Arthur reclaimed her in single combat against Oswald. Arthur let Oswald retain the the throne of Kent.

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Source
King Arthur; or, the British Worthy | John Dryden, 1691

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