In Greek mythology, Queen Endeïs (/ɛnˈdiːɪs/; Ancient Greek: Ενδηίς or Ενδαΐς) was the wife of King Aeacus and mother of the heroes Telamon and Peleus (since Peleus was the father of Achilles, Endeïs was Achilles's grandmother).
[3] Endeïs hated her stepson Phocus, Aeacus's son by the Nereid Psamathe, and wished he were dead.
[4] It is also thought that Telamon and Peleus were jealous of Phocus because he excelled at athletic sports.
In either case they drew lots and Telamon was chosen to murder Phocus, his half brother.
In the sport, Telamon threw a discus under the pretense of participating in the competition.