What is "erechtheus"

legendary first king and founder of Athens, from Latin Erechtheus, from Greek Erekhtheos, literally "render, shaker" (of the earth), from erekhthein "to rend, break, shatter, shake." Hence Erechtheum, the name of a temple on the Athenian acropolis.

Erechtheus (; ) in Greek mythology was the name of an archaic king of Athens, the founder of the polis and, in his role as god, attached to Poseidon, as "Poseidon Erechtheus". The mythic Erechtheus and an historical Erechtheus were fused into one character in Euripides' lost tragedy Erechtheus (423/22 BCE). The name Erichthonius is carried by a son of Erechtheus, but Plutarch conflated the two names in the myth of the begetting of Erechtheus.

Athenians thought of themselves as Erechtheidai, the "sons of Erechtheus". In Homer's Iliad (2. 547–48) he is the son of "grain-giving Earth", reared by Athena. The earth-born son was sired by Hephaestus, whose semen Athena wiped from her thigh with a fillet of wool cast to earth, by which Gaia was made pregnant.

In the contest for patronship of Athens between Poseidon and Athena, the salt spring on the Acropolis where Poseidon's trident struck was known as the sea of Erechtheus.