Aker “God of the Horizon” was first depicted as the torso of a recumbent lion with a widely opened mouth. Later, he was depicted as two recumbent lion torsos merged with each other and still looking away from each other. From Middle Kingdom onwards Aker appears as a pair of twin lions, one named Duaj (meaning “yesterday”) and the other Sefer (meaning “tomorrow”). Aker was thus often titled “He who’s looking forward and behind”. When depicted as a lion pair, a hieroglyphic sign for “horizon” (two merged mountains) and a sun disc was put between the lions; the lions were sitting back-on-back. In later times, Aker can also appear as two merged torsos of recumbent sphinxes with human heads.

Cult Aker appears for the first time during the 1st Dynasty with the kings (pharaohs) Hor Aha and Djer. An unfinished decorative palette from the tomb of Djer at Abydos shows Aker devouring three hearts. The location of Aker’s main cult center is unknown, though. His mythological role was fully described for the first time in the famous Pyramid Texts of king Teti.

Mythology Aker was first described as one of the earth gods guarding the “gate to the yonder site”. He protected the deceased king against the three demonic snakes Hemtet, Iqeru and Jagw. By “encircling” (i.e., interring) the deceased king, Aker sealed the deceased away from the poisonous breath of the snake demons. Another earth deity, who joined and promoted Aker’s work, was Geb. Thus, Aker was connected with Geb. In other spells and prayers, Aker is connected with Seth and even determined with the Set animal. This is interesting, because Seth is described as a wind deity, not as an earth deity. In the famous Coffin Texts of Middle Kingdom period, Aker replaces the god Kherty, becoming now the “ferryman of Ra in his nocturnal barque “. Aker protects the sun god during his nocturnal travelling through the underworld caverns.