Pelorus (Ancient Greek: Πέλωρος, Pelōros) was one of the Spartoi, the "Sown Men" who sprang fully armed from the earth in Greek myth. When the Phoenician prince Cadmus killed the dragon guarding the spring of Ares at Thebes and sowed its teeth on Athena's instruction, armed warriors rose from the furrows and fell to fighting one another. Only five survived — Echion, Udaeus, Chthonius, Hyperenor, and Pelorus — and these five helped Cadmus found the city of Thebes, becoming the ancestors of the Theban nobility.
Adapted from Wikipedia, "Dragon's teeth (mythology)" · CC BY-SA 4.0
I.Cadmus and the Spartoi
In Greek myth, dragon's teeth feature prominently in the legend of the Phoenician prince Cadmus; once planted, the teeth would grow into fully armed warriors. Cadmus killed the sacred dragon that guarded the spring of Ares, and Athena gave him half the dragon's teeth to sow. When he did, fierce armed men, known as the Spartoi, sprang up from the furrows of the earth.
Fearing these warriors, Cadmus threw a stone among them, which set them fighting one another until only five remained: Echion, Udaeus, Chthonius, Hyperenor, and Pelorus. These five survivors afterwards assisted Cadmus in founding the city of Thebes, and were regarded as the ancestors of the Theban nobility.
As penance for slaying the dragon, which was sacred to Ares, Cadmus served the god for a period of years; he later married Harmonia, daughter of Ares and Aphrodite. Echion, one of the surviving Spartoi, married Cadmus's daughter Agave, and their son Pentheus in time succeeded Cadmus as king of Thebes.
II.Jason
A second sowing of dragon's teeth appears in Jason's quest for the Golden Fleece. King Aeëtes of Colchis set Jason the task of sowing dragon's teeth given by Athena, from which armed warriors likewise sprang up from the earth.
Medea, the daughter of Aeëtes, advised Jason to throw a stone among the warriors so that they would turn on one another. The men fell to mutual combat and all perished, allowing Jason to overcome the challenge.
III.Modern references
The classical legends of Cadmus and Jason have given rise to the phrase "to sow dragon's teeth." It is used as a metaphor for doing something that has the effect of fomenting disputes or stirring up conflict that later springs forth.