Thetis’s Prophecy: Zeus and Poseidon Renounce Her
Catalogue ID: 02-olympian-gods/092-thetis-prophecy-zeus-poseidon-renounce
Cycle: Olympian gods — Zeus / Poseidon / Thetis; Achillean prelude
Version line: Pindaric / Apollodorean — son destined to be mightier than his father
Sources: Pindar, *Isthmian* 8.26–47; Apollodorus, *Library* 3.13.5; cf. Aeschylus, *Prometheus Bound* 907–927 (Prometheus’s secret about Thetis)
Source file: /workspace/greek-myth-catalogue/02-olympian-gods/092-thetis-prophecy-zeus-poseidon-renounce.md
Zeus and Poseidon both desired the Nereid Thetis. Themis (in Pindar) or Prometheus (in Aeschylus’s tragic secret) warned that Thetis was fated to bear a son greater than his father—if a god begot that child, he would overthrow the Olympian order as Zeus had overthrown Cronus. The rival gods therefore withdrew. Zeus compelled Thetis to marry the mortal Peleus so that her terrible son would be mortal Achilles, mightiest of warriors but no king of heaven. Thetis’s forced marriage is thus cosmic policy: desire checked by prophecy, Olympus preserved by a mortal wedding.
Catalogue the prophecy and renunciation apart from the shore-wrestling and the wedding feast.