Campulus 1 was a sacellarius at Rome in 799: Lib. Pont. 98. 13 ("Campulus sacellarius"). Campulus 1 took part in an assault on the bishop of Rome, Leo III (Leo 11), on 25 April 799, with others including Paschalis 4 and Mauros 6; he was among the pope's close retinue ("in pontificali obsequio") and conspired to lead him into a trap; after the attack, fearing an attempt at rescue by the pope's supporters, they tried to keep him under guard in the monastery of St Erasmus (see Anonymus 320): Lib. Pont. 98. 11-13.

After the rescue of Leo 11 by Albinus 1, they considered suicide, but instead robbed and destroyed the house of Albinus 1: Lib. Pont. 98. 14-15. They attacked and burned properties belonging to the see of St Peter, and made allegations against Leo 11, which they forwarded to the court of Charlemagne (Karoulos 1) where Leo 11 had been taken: Lib. Pont. 98. 17. Leo 11 was brought back to Rome in 800 by an escort of Frankish notables, who then investigated the allegations against him and questioned Campulus 1, Paschalis 4 and their colleagues for days; finally the charges were adjudged baseless and the accusers were themselves arrested and sent to Francia: Lib. Pont. 98. 20. Subsequently they were brought before Karoulos 1 in Rome and their guilt established; Campulus 1 allegedly blamed Paschalis 4 for leading him astray; all were then convicted and sent into exile in Francia: Lib. Pont. 98. 26.

All the exiles were released in 816 when the successor of Leo III (Leo 11), pope Stephen V (IV) (Stephanos 90), visited Louis the Pious (Lodoïchos 2) and they returned to Rome with the pope: Lib. Pont. 99. 2. Presumably Campulus 1 was among them. He was possibly a relation of pope Hadrian I (Hadrianos 1); according to Theophanes those who attacked Leo 11 were relations (συγγενεῖς) of Hadrianos 1; see Theoph. AM 6289.

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