Back راديلكيس الأول من بينيفنتو Arabic Раделчис I (Беневенто) Bulgarian Radelchis I Catalan Ράντελχις Α΄ του Μπενεβέντο Greek Radelchis I de Benevento Spanish Radelchis French Radelchis I de Benevento Galician Radelchi I dari Benevento ID Radelchi I di Benevento Italian Radelchis I Dutch
Radelchis I (also Radalgis) (died 851) was the treasurer, then prince of Benevento from 839, when he assumed the throne upon the assassination (possibly at his instigation) of Sicard and imprisonment of Sicard's brother, Siconulf, to his death, though in his time the principality was divided.
According to the Chronica S. Benedicti Casinensis, the gastald of Capua, Landulf the Old, who had been an ally of Sicard, freed the imprisoned Siconulf and, with the support of Guaifer, chief of the Dauferidi family of Salerno, brought him to that city to be proclaimed prince in opposition to Radelchis. This was the beginning of a civil war which was to last more than a decade.