Ridden

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Old English rīdan, of Germanic origin; related to Dutch rijden and German reiten .

wiktionary

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Morphologically ride +‎ -en.

See ride(verb)

See rid

etymonline

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ridden (adj.)

mid-14c., "that has ridden or travelled," past-participle adjective from ride (v.). The sense evolution, via horses, is from "that which has been ridden upon" to "broken in" (1520s) to, in compounds, "oppressed, taken advantage of" (1650s). In reference to witches, nightmares, etc., "to sit on or to ride as a horse" by 1590s.