The Nemean Lion: from Heracles' first labour to the star Regulus

The constellation of Leo is one of the few that truly resemble the animal they are named after. A sickle of stars outlines the mane and chest, a triangle marks the flanks and tail, and the figure stands out clearly in the spring sky. The Babylonians already called it “the great lion”, and for the Greeks that image could be nothing other than the most famous beast of their myths: the lion of Nemea.

The beast with an invulnerable hide

Hesiod, in the Theogony, places the lion in the lineage of monsters and says that it was Hera who reared it and settled it in the hills of Nemea, in the Peloponnese, as a plague to mankind. Later sources add the decisive detail: its hide could not be pierced by any weapon. Killing the beast was the first of the labours imposed on Heracles by King Eurystheus of Tiryns, and the most emblematic.

Apollodorus relates that the hero first tried his arrows, which bounced off, and then his club. Having chased the lion into its den with two entrances, he blocked one and faced it bare-handed, gripping its neck until it choked. To skin it he had to use the animal's own claws. From then on Heracles wore the hide as a cloak and the head as a helmet, and that is how almost all ancient art portrays him.

The lion among the stars

According to the mythographers it was Zeus, or according to others Hera herself, who placed the lion in the sky as a memorial of the deed. At the centre of the figure shines Regulus, one of the brightest stars of the zodiac, lying almost exactly on the ecliptic. Ptolemy called it Basiliskos, “little king”, and the Latin name Regulus is its translation. The long astrological tradition counted it among the royal stars, linked to command and sovereignty.

Another star, Denebola, marks the tail and bears an Arabic name meaning precisely “the lion's tail”. Once, the tuft of faint stars beyond the tail was part of the figure. In the third century BC the astronomer Conon of Samos identified it with the lock of hair that Queen Berenice II of Egypt had offered to the gods for the return of her husband Ptolemy III from war. Callimachus made a poem of it, which Catullus translated into Latin.

The summer Sun

In antiquity the Sun crossed Leo at the height of summer, during the hottest days of the year. This link helped make the lion a solar animal, a symbol of fire, power and kingship, associations that Hellenistic and medieval astrology codified by assigning the sign to the Sun as its own domicile. In mosaics and illuminated manuscripts Leo often appears with a radiating mane, almost as if it were a small star.

The Nemean Lion thus holds a core of meanings that runs through the centuries: brute force that only a greater force, joined with ingenuity, can tame. Heracles does not win with weapons, but by learning his opponent's limits and turning its own nature against it. The lion-skin cloak becomes the visible sign of this victory, and the sky preserves its memory.