Gratiosos 3 was a relation of Sergios 53 (and therefore of Christophoros 26): Lib. Pont. 96. 31 ("cognatus iamfati Sergii"). In 768 he was chartularius and shortly afterwards became dux: Lib. Pont. 96. 9 ("Gratiosus, tunc chartularius, postmodum dux"), 96. 31 ("Gratiosus quidam dux"). Gratiosos 3 and Demetrios 16 accompanied Toto 1 to the Gate of St Pancratius and the Ianiculum to meet Sergios 53 and the Lombards who had come with him to Rome to overthrow the antipope Constantine (Konstantinos 140); after Toto 1 killed Racipert 1, Gratiosos 3 and Demetrios 16 took Toto 1 in the rear and killed him with their lances: Lib. Pont. 96. 9. Soon afterwards, after the removal of Konstantinos 140 and the election of another antipope, Philippus (Philippos 11), Gratiosos 3 carried out the wishes of Christophoros 26 and removed Philippos 11 from the Lateran palace: Lib. Pont. 96. 11.

He is blamed in the Liber Pontificalis for atrocities committed shortly after the election of pope Stephen IV (III) (Stephanos 84) with people from Tuscia and Campania; these apparently included the blinding of the tribunus Gracilis 1; he also took soldiers from Tuscia and Campania to the monastery of Cellae Novae, dragged Konstantinos 140 out, blinded him and left him lying in the street: Lib. Pont. 96. 14 ("prefato Gratioso et fortioribus eius per quorum auctoritatem tanta mala operabantur"). After the arrival in Rome of the Lombard king Desiderius (Desiderios 3), Gratiosos 3 remained for a time by the side of Christophoros 26 and Sergios 53, but with other supporters deserted them, pretending to be going to his own home but secretly making his way with his followers to pope Stephanos 84 and Desiderios 3 who were in St Peter's: Lib. Pont. 96. 31 (they allegedly found the Porta Portuensis closed and passed through only after removing it from its hinges).

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