Romuald I (also spelled Romoald and in Italian Romoaldo), duke of Benevento (662–677) was the son of Grimoald, king of the Lombards. He received Benevento when his father usurped the throne in 662. Grimoald sent the deposed king Perctarit's wife Rodelinde and son Cunincpert to the court of his son in Benevento.
Romuald betrothed his sister Gisa to Byzantine Emperor Constans II. The Byzantines were then besieging Benevento and Romuald's valiant defence of the city was failing, when Grimoald showed up and routed the Byzantine menace. Romuald then took Taranto and Brindisi, much limiting the Byzantine influence in the region. He received military aid from the Bulgar Alcek horde, which had resided in the south of the peninsula since the fall of Rome. In return he gave them grazing rights in 667.
Romuald never saw the kingdom his father had won and so well defended, Perctarit returned and ceased the kingship.
He was succeeded by his son by Theodrada, daughter of Duke Lupus of Friuli, Grimoald II.
| Regnal titles | ||
|---|---|---|
| Preceded by Grimoald I |
Duke of Benevento 662–677 |
Succeeded by Grimoald II |