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(on Wikipedia)
https://www.imdb.com/title/tt0116136/
https://www.uphe.com/movies/dragonheart
A king, resurrected with half of a dragon's heart, rules with an iron fist but is opposed by his former-mentor, a former dragon-slayer now allied with that last dragon who has the remaining half of the king's heart.
A fine, action-heavy, fantasy. Has a lot of recognizable stars.