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Regulus
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Why is the symbol of Leo a lion?
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Regulus

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Also known as: Alpha Leonis
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Also called:
Alpha Leonis
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Regulus, brightest star in the zodiacal constellation Leo and one of the brightest in the entire sky, having an apparent visual magnitude of about 1.35. It is 77 light-years from Earth. The name Regulus, derived from a Latin word for king, reflects an ancient belief in the astrological importance of the star.

(List of Brightest Stars as Seen from Earth)

The Editors of Encyclopaedia Britannica