Desiderius (died 587) was a Gallo-Roman dux in the Kingdom of the Franks during the reigns of Chilperic I and Guntram.
When Sigebert I of Austrasia died in 575, Chilperic sent Desiderius to invade his kingdom, but Guntram of Burgundy sent the patrician Mummolus against him and Desiderius was defeated and forced to retreat, leaving Austrasia to Sigebert's son Childebert II.
In 583, Chilperic gave the province of Aquitaine to him and Bladast and sent them into Vasconia with a large army.
The chronicle of John of Biclar reports how around 587 Frankish forces attacked the recently enthroned king Reccared of Visigothic Spain, but were defeated, their general, Desiderius, being killed in battle.
[3] His widow Tetradia, daughter of a noblewoman and a peasant, was taken to court by her former husband Eulalius, from whom she had fled with a large portion of his fortune.