Radelgar () was the prince of Benevento from 851 until 854. He was the son of Radelchis I and Caretrude.Julie Michelle Anderson, Historical Memory, Authority, and the Written Word: A Study of the Documentary and Literary Culture at the Early Medieval Court of Benevento, 700–900 CE, PhD dissertation, University of Toronto, see esp. pp. 97–107. He succeeded his father and married a Beneventa noblewoman named Tasselgarda.Thierry Stasser, "Les mariages des familles princières d'Italie du Sud (fin VIIIe–fin XIe siècles)", in Martin Aurell (ed.), Les Stratégies matrimoniales (IXe–XIIIe siècle) (Brepols, 2013), pp. 77–88.
Radelgar died at the age of 31 and is memorialized by a Latin epitaph of fifty lines. His brother Adelchis seized the throne, setting aside Radelgar's infant son, Gaideris. Gaideris later had Adelchis assassinated and seized the throne. Radelgar also had a daughter who married Lando III of Capua.
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