Rendakis (), also Rendakios (Ρενδάκιος) or Rentakios (Ρεντάκιος) was a powerful Byzantine noble family in the 8th to 10th centuries.

History The Rendakis family was first mentioned during the reign of Leo III the Isaurian (r. 717–741).Byzantinoslavica 1977, Volume 38–39, p. 178 Although the family were native Greek speakers, the etymology of the family name is believed by some scholars to have been of Slavic origin.Vryonis 1981, p. 136: "Of Slavic origin were the families of Giabas, Rentacius, Branas (?), Bogdanos, and Boilas" In the beginning of the 8th century, the number of officials of clearly provincial origin had increased, and the Rendakioi was one of these families.Brubaker-Haldon, p. 589 In the 9th century, the family numbered among the most powerful families in the Byzantine Empire, alongside those of Bryennios, Choirosphaktes, Monomachos, and Tessarakontapechys.Vryonis 1971, p. 161: "... ninth century [...] a clearly formed aristocracy [...] Rentacius, Tessaracontopechys, Bryennius, Choirosphactes, and Monomachus."

Members Sisinnios Rendakis (Σισίννιος, ), patrikios and strategos of the Anatolic Theme under Emperor Leo III, according to the Miracles of Saint Demetrius, he commanded the imperial fleet that saved Thessaloniki from the barbarians.Ekonomou, p. 236 He was from Macedonia. He fought against and was beheaded by the Bulgarians in ca. 718–719 because he had supported the attempt by the deposed emperor Anastasios II to recover his throne. Rentakios (fl. 866–867), protovestiarios and parakoimomenos.Guilland 1967, p. 204. Rentakios Helladikos (fl. 913–927), a native of Hellas, blinded by Emperor Romanos I Lekapenos for the plot to kill his own father, stealing and selling his family possessions, and forging a letter to Tsar Symeon of Bulgaria in order to desert.Skylitzes 2010, p. 207 Niketas Rentakios or Niketas Helladikos, Peloponnesian magnate Sophia, married Christopher Lekapenos (co-emperor 921–931), son of Romanos I Constantine Rendakis Demetrios PhalakrosCheynet 2006, p. 61 Rendakios the Athenian (fl. 1055), son-in-law of Sergios Betelakes. Married Helene.

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