Scythian, son of Seuthes. He wrote the so-called Scythinian Oracles[1] and Marriage of the river Hebros and Purifications and a Theogony in prose and Arrival of Apollo among the Hyperboreans in meter. He came from Scythia to Greece.
The legendary arrow belongs to him, the one he flew on from Greece to Hyperborean Scythia. It was given to him by Apollo.[2]
Gregory the Theologian mentioned this man in his Epitaphios for Basil the Great.[3]
They say[4] that once, when there was a plague throughout the entire inhabited world, Apollo told the Greeks and barbarians who had come to consult his oracle that the Athenian people should make prayers on behalf of all of them. So, many peoples sent ambassadors to them, and Abaris, they say, came as ambassador of the Hyperboreans in the third Olympiad.[5]
[Note] that the Bulgarians thoroughly destroyed the Avars[6] by force.
[Note] that these Avars drove out the Sabinorians, when they themselves had been expelled by peoples living near the shore of the Ocean, who left their own land when a mist formed in the flood of the Ocean and a crowd of griffins appeared; the story was that they would not stop until they had devoured the race of men. So the people driven away by these monsters invaded their neighbors. As the invaders were stronger, the others submitted and left, just as the Saragurians, when they were driven out, went to the Akatziri Huns.[7]
The declension is Abaris, Abaridos [genitive singular], Abaridas [accusative plural], and with apocope Abaris [also accusative plural, with a long iota].
See about these things under 'Bulgarians'.[8]