In Greek mythology, Absyrtus or Apsyrtus (Ancient Greek: Ἄψυρτος) was a Colchian prince, son of King Aeëtes and brother or half-brother of Medea. When Medea fled with Jason and the Golden Fleece, Absyrtus was murdered — either as a child whose limbs Medea cast into the sea to delay pursuit, or as an adult commander lured to Artemis's isle and slain by Jason. The Absyrtides islands were named after him.
Adapted from Wikipedia, "Absyrtus" · CC BY-SA 4.0
I.Family
Absyrtus was the son of Aeëtes of Colchis and sibling of Medea and Chalciope. His mother is variously given: Hyginus names Ipsia; Hesiod and the Bibliotheca name Idyia; Apollonius names Asterodeia, a Caucasian nymph, making him half-brother to Medea by Idyia; others name Hecate, the Nereid Neaera, or Eurylyte. As a descendant of Helios he is said to have lived in his own palace beside his father's.
II.Death and the Argonauts
In one widespread tradition Medea took the boy with her; nearly overtaken by Aeëtes, she murdered him, cut his body into pieces, and strewed them on the road so that her father would delay to gather the limbs. Tomi was believed to derive its name from temnō ("cut").
In another tradition Absyrtus was not taken aboard but sent in pursuit. He overtook the fugitives in Corcyra, where Alcinous refused to surrender Medea; later, on an island of Athena (or in Apollonius on a Brygean isle of Artemis), he was lured by Medea's false promises and slain by Jason. Apollonius's Argonautica makes him an adult commander ambushed on Artemis's sacred island — Zeus's wrath follows the murder.