Radoald (also Raduald) (died 647) was the duke of Benevento (the southernmost Lombard duchy in medieval Italy) from 642 to his death in 647.
In 642, Slavic plunderers landed near Siponto on the Adriatic.
Aiulf personally led his forces against the intruders, but his horse fell into a pit dug by the Slavs around their camp and he was surrounded and killed.
Radoald knew the Slavic language and having conversed with them, they lowered their guard; whereupon his forces fell on them with great slaughter, causing them to depart.
[1] With the support of King Rothari, Radoald succeeded Aiulf.