Of, relating to, or characteristic of Lord Byron or the Byronic style; embodying romantic passion and dark complexity.
From Lord Byron + the suffix '-ian' (relating to). It's a more formal variant of 'Byronesque,' used in literary criticism and academic contexts.
The 'Byronian hero' became a template in literature—brooding, powerful, morally complex, and attractive despite (or because of) their darkness; you see this character type everywhere from Batman to modern anti-heroes.
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