Aker is an angel mentioned in the Greek Apocalypse of Ezra whose name was revealed to Esdras as one of the nine angels who will govern "at the end of the world." The nine angels mentioned are: Michael, Gabriel, Uriel, Raphael, Gabuthelon, Aker, Arphugitonos, Beburos, and Zebuleon. Aker is not considered an archangel and is a non-canonical figure. Theologians surmise that Aker may be comparable to Kyr.
- Walker, Alexander (1886). Roberts, Alexander, ed. Ante-Nicene Fathers: The Writings of the Fathers Down to A.D. 325. 8. James Donaldson and A. Cleveland Coxe. Buffalo, NY: Christian Literature Publishing Co. Retrieved October 20, 2011.
Do you know, Esdras, the names of the angels at the end of the world? Michael, Gabriel, Uriel, Raphael, Gabuthelon, Aker, Arphugitonos, Beburos, Zebuleon.
- The Old Testament Pseudepigrapha: Apocalyptic Literature & Testaments. Edited by James H. Charlesworth