The Thetis of Myth ...

Thetis was one of the Nereids. Zeus desired her, but she rejected his advances. The goddess Themis then revealed that Thetis was fated to bear a son who was mightier than his father; fearing for his dominion, Zeus gave Thetis as bride to a mortal, Peleus, and all the gods attended the wedding.

Thetis bore one son, Achilles, whom she tried unsuccessfully to make immortal. In one version of the story, she anointed the infant's body with ambrosia and then placed it upon a fire in order to burn away the mortal parts; when she was interrupted by the child's horrified father, she deserted their household in a rage. In a later version, she dipped the child in the river Styx holding him by the heel; all the parts that the river touched became invulnerable, but the heel remained dry. Achilles was later killed in the Trojan war.

The Andromache of Myth ...

Andromache was the daughter of Eetion, ruler of the Cilician city of Thebe; she was the wife of the Trojan hero Hector and the mother of Astyanax.

Andromache's father and brothers were killed by Achilles when he captured Thebe during the Trojan War; her mother was spared and ransomed, but died in Troy before its fall. During the seige of Troy, Achilles also killed her husband, Hector, and then desecrated his body. Andromache herself became the slave and concubine of Neoptolemus, Achilles' son, when Troy was captured; her son Astyanax was flung by the Greeks from the walls of Troy.

After the end of the Trojan War, Andromache was taken to Greece by Neoptolemus and bore him a son, Molossus, who gave his name to the Molossian people. Following Neoptolemus' death, Andromache married Helenus, one of the few surviving children of King Priam of Troy; Helenus became the ruler of the Greek region of Epirus.