[3] In later times, Aker can also appear as two merged torsos of recumbent sphinxes with human heads.

[4] Aker appears for the first time during the 1st Dynasty with the kings (pharaohs) Hor Aha and Djer.

[2] An unfinished decorative palette from the tomb of Djer at Abydos shows Aker devouring three hearts.

His mythological role was fully described for the first time in the famous Pyramid Texts of king Teti.

[6][2] In the famous Coffin Texts of Middle Kingdom period, Aker replaces the god Kherty, becoming now the "ferryman of Ra in his nocturnal barque ".