A stub commemoration
Diomedes and Laurence appear in the August 28 commemorations of the Greek and wider Orthodox calendars, listed among other martyrs of the day such as Hermes of Rome, the 33 Martyrs of Nicomedia, and Susanna (Shushanik) of Georgia. In each calendar they are recorded only as names, with no accompanying account of their origin or trial.
They should not be confused with two better-known saints of nearby feasts: the martyr Diomedes the Physician, commemorated on August 16, and the martyr Laurence (Lawrence) of Rome, the archdeacon commemorated on August 10. The August 28 Diomedes and Laurence are a distinct pair whose biographical details are not preserved.