Splendor

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late Middle English: from Anglo-Norman French splendur or Latin splendor, from splendere ‘shine, be bright’.

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From Anglo-Norman splendur, splendour, or directly from its source Latin splendor, from the verb splendere(“to shine”).

etymonline

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splendor (n.)

mid-15c., splendoure, "radiance, brilliance, source of magnificence or excellence," from Old French esplendour, Anglo-French esplendour (Old French splendeur, splendor, 12c.) and directly from Latin splendor "brilliance, brightness," from splendere "be bright, shine" (see splendid).