Briareus
Briareus was described in Greek mythology as a fifty-headed and hundred-handed giant, who guarded Cronos on the island of Ogygia. The mythologist, Michael MacRae, interprets this as a reference to Briareus as the captain of a ship with fifty oarsmen[985.180].
Felice Vinci notes that Aristotle had the ‘Pillars of Briareus’ as an earlier name for the Pillars of Heracles(a). Frank Joseph claims that he was also known as Aegeon (Aigaios)[104] whereas Hesiod and Homer have recorded Briareus as the son of Aigaios(b).
*Thorwald C. Franke has subsequently advised that Vinci’s reference is incorrect and that it was Aelian rather than Plutarch(c) who quoted Aristotle.*
(a) Fragment 687 Rose, in Plutarch, Il Voltodella Luna (Adelphi, Milan, 1991) (see ‘c’ below)
(b) https://www.theoi.com/Titan/HekatonkheirBriareos.html
(c) https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Plutarch/Moralia/The_Face_in_the_Moon%2a/D.html (see footnote 302, where fragment 678, not 687 is cited))