1. Regulus (α Leonis): The brightest star in Leo, it is a blue-white star and also one of the brightest stars in the night sky. Regulus marks the heart of the lion.
2. Denebola (β Leonis): The second brightest star in Leo, Denebola is a white star located at the tail of the lion.
3. Algieba (γ Leonis): A double star system composed of two yellow giant stars, Algieba marks the head of the lion.
These stars are important because they are easily visible and help to create the distinctive shape of the constellation Leo.
