Amantius (Greek: Ἀμάντιος, romanized: Amantios) was the head chamberlain (praepositus sacri cubiculi) of the Byzantine emperor Anastasius I.
Defeated by Justin I in the intrigues and power struggles after Anastasius' death, he was executed.
[2] Towards the end of Anastasius' life, the emperor and Amantius both had similar dreams on who would succeed on the throne, which were interpreted by the soothsayer Proclus Oneirocrites.
[3] He erected a church dedicated to Saint Thomas at Constantinople, in an area which later was named ta Amantou after him.
[4] When Anastasius died on 9 July 518, Amantius, who as a eunuch was unable to claim the throne himself, instead sponsored the candidacy of Theocritus.