linaliee:

Abraxas, also known as Abrasax, is a Gnostic solar deity associated by the ancients  with Yahweh, Mithras and the Celtic Belenus, as well as Yeshu (Jesus). Amulets and seals bearing the figure of Abraxas were common in the second century, and were used as recently as the thirteenth century in the seals of the Knights Templar. By medieval times, Abraxas was relegated to the ranks of demons.

More on: http://symboldictionary.net/?p=1020