Steed

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Old English stēda ‘stallion’; related to stud2.

wiktionary

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From Old English steda(“stallion, stud”) (compare Old Dutch stoti(“herd of horses”), Old High German stuot(“herd of horses”)).

etymonline

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steed (n.)

Old English steda "stallion, stud horse," from Proto-Germanic *stodjon (source also of Old Norse stoð), from the same Germanic root as Old English stod (see stud (n.2)). In Middle English, "a great horse" (as distinguished from a palfrey), "a spirited war horse." Obsolete from 16c. except in poetic, rhetorical, or jocular language.