Abdon and Sennen, born in Persia "were arrested and taken to Rome under the Emperor Decius. They were scourged with cords weighted with lead and beheaded" (Roman Martyrology). This was in the middle of the third century (A. D. 254).
Intret in conspectu tuo, Domine, gemitus compeditorum: redde vicinis nostris septuplum in sinu eorum: vindica sanguinem sanctorum tuorum, qui effusus est. * Deus, venerunt gentes in haereditatem tuam: polluerunt templum sanctum tuum: posuerunt Jerusalem in pomorum custodiam.
Let the sighing of the prisoners come in before Thee, O Lord; render to our neighbours sevenfold in their bosom; revenge the blood of Thy saints, which hath been shed. * O God, the heathens are come into Thy inheritance: they have defiled Thy holy temple: they have made Jerusalem as a place to keep fruit.
(Psalm 78:11-12,1 from the Introit of Mass)
Deus, qui sanctis tuis Abdon et Sennen ad hanc gloriam veniendi copiosum munus gratiae contulisti: da famulis tuis suorum veniam peccatorum; ut Sanctorum tuorum intercedentibus mentis, ab omnibus mereantur adversitatibus liberari.
O God, who didst endow Thy holy martyrs Abdon and Sennen with abundant gifts of grace that they might come to their present glory; forgive the sins of Thy servants, that the merits of Thy saints pleading on their behalf, they may deserve to be delivered from all adversity.
From the Catholic Encyclopaedia: http://www.newadvent.org/cathen/01032a.htm