Atenulf, Abbot of Montecassino

Atenulf (died 30 March 1022) was the Abbot of Montecassino from 1011 until his death. He was a cousin of Prince Pandulf II of Capua, a younger son of Prince Pandulf III and brother of Prince Pandulf IV.

In 999, Atenulf was given as a hostage to Duke Ademar of Spoleto after the latter raided the Principality of Capua on behalf of the Emperor Otto III. Ademar sent his hostage back to Germany. Atenulf's stay in Germany seems to have left an impression: German architectural influence is evident in the buildings he erected while abbot. He was elected abbot in 1011, and in 1014 he received a diploma from the recently-crowned Emperor Henry II. On 13 March 1014, he received a privilege listing the lands of Montecassino from Pope Benedict VIII.

On 5 May 1017, Princes Pandulf II and Pandulf IV granted the "church, fortified villa and castle" (ecclesia et castrum et oppidum) of Civita di Sant'Urbano to Atenulf. On 10 May, they granted the land, mountain and church of Sant'Angelo in Barrea to Atenulf, who commissioned Prior Azzo to restore it, since it had escaped destruction during Muslims raids a century earlier and was still the home of a few monks.

On 13 July 1019 or 1020, Atenulf received a second diploma from Henry II, confirming the abbey's possession of Sant'Urbano and Vicalvi. In August and October 1017, Atenulf acquired shares in the churches of Santa Maria and Sant'Apollinare in Casalpiano. In January 1020, two abbots, Peter and Paul, gave Atenulf the monastery of Saint Benedict in the diocese of Trivento, founded in February 1002, along with two churches, Santa Lucia and Santa Maria de Cruce. In May 1022, Magipertus of Aquino and his wife, Anna, gave to Atenulf the region called Limata between the Liri and the town of San Giovanni Incarico and the church of San Lorenzo in the town of Aquino.

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