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Atenulf II (died October 1064) was the duke of Gaeta for a brief two years (1062–1064) under the regency of his mother, Maria.
Before the battle, the Normans and Lombards agreed on chosing Atenulf, Prince of Benevento as their new leader, while the Byzantine Catepan Michael Doukeianos was replaced by Exaugustus Boioannes.
The battle had its origin in the decision of Arduin the Lombard, a Greek-speaking Lombard who had fought for the Byzantines, to change sides and form a coalition with the Normans Rainulf Drengot and the Hauteville brothers (William Iron Arm, Drogo, Humphrey), and the Lombards Atenulf of Benevento and Argyrus of Bari.
In 1014, at the Castro Argento, also on Gaetan soil, Emilia and the Bishop Bernard, her brother-in-law, hosted several local leaders: Daufer of Traetto, Pandulf II of Capua, Sergius IV of Naples, Atenulf of Montecassino, and the archbishop of Capua.
As senatrix and ducissa of Gaeta, Maria ruled as regent for her and Atenulf's son Atenulf II after her husband's death on 2 February 1062.