Osireion is located to the rear of the temple named after the New Kingdom Nineteenth Dynasty of Egypt pharaoh Seti I.
 It is located at Abydos, to the rear of the temple of Seti I. 
Menmaatre Seti I (or Sethos I as in Greek) was a pharaoh of the New Kingdom Nineteenth Dynasty of Egypt, the son of Ramesses I and Sitre, and the father of Ramesses II. 
