The headword is genitive plural of this participle, evidently extracted from the first quotation given.
[1] Quotation unidentifiable, but Adler suggests Cassius Dio -- presumably on the basis of Dio 67.6.1. Douras was a king of Dacia: reigned 68-87, as the immediate predecessor of Trajan's opponent Dekebalos (87-106: see delta 189, delta 344, epsilon 1864, epsilon 2038, upsilon 483). The quotation is hard to construe with precision, however, not least because of the different but equally obscure form in which it recurs at upsilon 503, q.v.
[2] An approximation of part of Menander Protector fr. 18.4 Blockley (162-163, De legationibus Romanorum ad Gentes 12.28). In 575 Persian attacks led by Tanchosdro (cf. delta 1327 note) in the Roman east around Dara (cf. delta 68) stopped after a truce, and the conflict resumed in Armenia in the spring of 576; cf. Blockley (273, note 201). See further excerpts from this fragment at delta 1327 and pi 1114.