Hagia is an Imperial Agri-world located in the Sabbat Worlds Sector of the Segmentum Pacificus that was the birthplace of Saint Sabbat and now serves as the burial place for her remains, thus transforming Hagia into an important Shrine World of the Ecclesiarchy as well.
During the Sabbat Worlds Crusade the Forces of Chaos attacked Hagia and mocked its people by calling themselves "Infardi," which was the word in the local dialect for "Pilgrim." Colonel-Commissar Ibram Gaunt and his Astra Militarum regiment, the Tanith First and Only, fought the Infardi in the planetary capital city of Holy Doctrinopolis and drove them out though at a very heavy cost.
To redeem himself and his regiment, Gaunt led an honour guard to the Shrinehold of Saint Sabbat to safeguard the relics there from the incoming Chaos Fleet.
- Holy Doctrinopolis - Holy Doctrinoplois was the planetary capital city.
- Bhavnager - Bhavanger was a town that was the scene of a pitched battle between the Imperial liberation force and Infardi cultists during the Sabbat Worlds Crusade.
- Shamiam - Shamiam was a town on the Tembarong Road.
- Honour Guard (Novel) by Dan Abnett