Nǎpòlún Yīshì shì Fǎguó lìshǐ shàng de chuánqí rénwù.
Napoleon the First is a legendary figure in French history.
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一世 has a classical, literary flavor. In historical/regal contexts it means 'the First' (Napoleon 一世). In literary use, it means 'a lifetime' or 'one's whole life.' The phrase 一世英名 (a lifetime of heroic fame) is a common set phrase.