A truncated version (also in the Ambrosian Lexicon, according to Adler) of Hesychius s.v.: "Pillars of Briareos: the ones called Herakleian". Aelian, Varia Historia 5.3 expands: "Aristotle [fr. 678 Rose, in the Dubia section] says that the Pillars now called Herakleian, before they were called this, were called [Pillars] of Briareos; but after Herakles had purified land and sea and become indisputably the benefactor of mankind, in honour of him they put Briareos out of mind and named [the Pillars] Heraklean". Briareos, child of Ge and Ouranos, was a fifty-headed, hundred-handed monster.
For the Pillars (either stelai, as here, or kiones) of Herakles, at the western extremity of the Mediterranean, see under alpha 1143; cf. eta 464.