Thalassa

Accounts of Thalassa's place in cosmogony vary among the sources summarized in the modern literature. Hyginus (preface to Fabulae, as summarized in the secondary sources) treats Mare/Thalassa as a daughter of Aether and Dies (Day) and sister to Terra and Caelus; paired with Pontus she produces fish. Other traditions recorded in scholia and later mythographers assign Thalassa a maternal role — Diodorus Siculus is cited as calling 'Thalatta' mother of the Telchines and the sea-nymph Halia, while a scholion on Apollonius of Rhodes records a tradition (attributed to Ion of Chios) naming her mother of Aegaeon/Briareus. The Orphic Hymn to the Sea equates Thalassa with Tethys and, in that hymn, calls her mother of Kypris (Aphrodite). These variant placements indicate flexible genealogical uses of the sea-personification across Greek and Roman sources.

In literary personifications Thalassa commonly appears in the form of a woman when addressing humans (e.g., Babrius' fable-accounts where the sea 'assumes the form of a woman' to speak). In later Roman and eastern Mediterranean mosaic art she is depicted half-submerged and clothed in bands of seaweed; specific ornamental attributes recorded in the survey literature include crab-claw horns (an attribute transferred in iconographic practice from Oceanus), a ship's oar in one hand and a dolphin in the other. These visual elements are attested in the mosaic tradition summarized by modern reference works rather than as exhaustive or exclusive traits across all sources.

Sources represent Thalassa principally as a speaking personification and as a genealogical principle rather than as an agent endowed with enumerated magical feats. In Babrius' fables and other literary traditions she gives reasoned replies (for example blaming winds for storms or advising rivers who complain about salt) and participates in moral or didactic discourse. Mythographers attribute to her parental roles (mothering Telchines, Halia, Aegaeon/Briareus, or — in Orphic schema — Kypris) and literary dialogues (e.g., Lucian) show her interacting with other water-deities in conciliatory or restorative modes. The surviving materials do not record ritual powers, charms, or explicit supernatural abilities beyond those implied by personification and genealogical status.