The headword (perfect middle/passive participle, masculine nominative singular, of diaxara/ssw) is presumably extracted from the quotation given.
[1] Attributed by Bernhardy to Menander Protector (mu 591), and accepted as such by Blockley (fr. 30.2, 242-243); cf. Favuzzi [cited under alpha 1990] 56. For Narses see nu 42. Blockley suggests that this unplaced fragment and the two surrounding it, fr. 30.1 (cf. theta 99) and fr. 30.2 (cf. pi 2311), pertain to the last years of Narses's campaign in Italy under Justinian; cf. Blockley (286, note 323). The approximate time frame would then be 562-566. On Justinian see generally iota 446.