A historical Welsh personal name, also used in English genealogy and literature to refer to medieval Welsh rulers or fictional characters.
From Welsh cad (battle) + gwawl (light/wall) + der/dur (water/protector). The name combines warrior-related elements and appears throughout Welsh history.
Cadwallader was the name of an actual 7th-century Welsh king, but it became so legendary that it shows up in superhero origin stories—Captain Marvel/Shazam's magical words include 'Advance!' which some trace to ancient power words.
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