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Pollution, or elbow.[1] What is honourable and worthy of reverence is also called agos; hence priesthoods [are called] all-holy [panageis], and a number of other things.[2]
Thucydides [writes]: "the Spartans sent envoys to Athens demanding the expulsion of the goddess's curse [agos]. It was that against Cylon, the ancient Athenian Olympic victor. [...] And they banished the accursed [enageis]."[3]
But agos when oxytone [means] leader.[4]

Ἄγος: μίασμα, ἢ ἀγκών. λέγεται δὲ ἄγος καὶ τὸ τίμιον καὶ ἄξιον σεβάσματος, ἐξ οὗ καὶ αἱ ἱέρειαι παναγεῖς, καὶ ἄλλα τινά. Θουκυδίδης: πέμψαντες οἱ Λακεδαιμόνιοι πρέσβεις ἐκέλευον τοὺς Ἀθηναίους τὸ ἄγος ἐλαύνειν τῆς θεοῦ. ἦν δὲ τὸ κατὰ Κύλωνα τὸν Ὀλυμπιονίκην τὸν Ἀθηναῖον τὸν πάλαι. καὶ ἤλασαν τοὺς ἐναγεῖς. Ἀγὸς δὲ ὀξυτόνως ὁ ἡγεμών.

The opening material here is also in Photius and other lexica.
[1] The second gloss here is a mistake (perhaps by confusion with the following entry, where the same word, ἀγκών , is translated 'embrace').
[2] An ἄγος is "any matter of religious awe": LSJ s.v.; see also pi 150.
[3] Thucydides 1.126.2-12 (web address 1), here so drastically abridged as to be misleading. (This banishment was part of the events of 632 BCE, now relevant two centuries later in the build-up to the Peloponnesian War. The original 'accursed' had returned -- and nobody was banished in 432.)
[4] From Philoponus, Differences. (For this epic/poetic noun see LSJ s.v.)

William Hutton (Altered headword, cosmetics, raised status) on 21 October 2000@16:02:46.
David Whitehead (augmented keywords; cosmetics) on 9 February 2003@08:40:55.
Catharine Roth (tweaked notes, added cross-reference and link) on 23 April 2008@15:19:18.
David Whitehead (expanded notes; more keywords; cosmetics) on 6 January 2012@04:34:35.
Catharine Roth (upgraded link) on 6 January 2012@12:22:26.

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