<P> Poseidon (/ pəˈsaɪdən, pɒ -, poʊ - /; Greek: Ποσειδῶν, pronounced (pose͜edɔ́͜ɔn)) was one of the Twelve Olympians in ancient Greek religion and myth . He was god of the Sea and other waters; of earthquakes; and of horses . In pre-Olympian Bronze Age Greece, he was venerated as a chief deity at Pylos and Thebes . </P> <P> Poseidon was protector of seafarers, and of many Hellenic cities and colonies . In Homer's Iliad, Poseidon supports the Greeks against the Trojans during the Trojan War . In the Odyssey, during the sea - voyage from Troy back home to Ithaca, the Greek hero Odysseus provokes Poseidon's fury by blinding his son the Cyclops Polyphemus, resulting in Poseidon punishing him with storms, the complete loss of his ship and companions, and a ten - year delay . Poseidon is also the subject of a Homeric hymn . In Plato's Timaeus and Critias, the island of Atlantis was Poseidon's domain . His Roman equivalent is Neptune . </P> <P> The earliest attested occurrence of the name, written in Linear B, is 𐀡𐀮𐀆𐀃 Po - se - da - o or 𐀡𐀮𐀆𐀺𐀚 Po - se - da - wo - ne, which correspond to Ποσειδάων (Poseidaōn) and Ποσειδάϝονος (Poseidawonos) in Mycenean Greek; in Homeric Greek it appears as Ποσειδάων (Poseidaōn); in Aeolic as Ποτειδάων (Poteidaōn); and in Doric as Ποτειδάν (Poteidan), Ποτειδάων (Poteidaōn), and Ποτειδᾶς (Poteidas). The form Ποτειδάϝων (Poteidawon) appears in Corinth . A common epithet of Poseidon is Ἐνοσίχθων Enosichthon, "Earth - shaker", an epithet which is also identified in Linear B, as 𐀁𐀚𐀯𐀅𐀃𐀚, E-ne - si - da - o - ne, This recalls his later epithets Ennosidas and Ennosigaios indicating the chthonic nature of Poseidon . </P> <P> The origins of the name "Poseidon" are unclear . One theory breaks it down into an element meaning "husband" or "lord" (Greek πόσις (posis), from PIE * pótis) and another element meaning "earth" (δᾶ (da), Doric for γῆ (gē)), producing something like lord or spouse of Da, i.e. of the earth; this would link him with Demeter, "Earth - mother". Walter Burkert finds that "the second element da - remains hopelessly ambiguous" and finds a "husband of Earth" reading "quite impossible to prove ." </P>

Who is known as the earth shaker in ancient greek mythology
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