Gair is a character who appears in the background story of Fire Emblem: Genealogy of the Holy War. He was a bishop in ancient Jugdral, who traveled to Archanea by unknown means and made a blood pact with Loptous, a survivor of a great war between Divine Dragons and Earth Dragons, serving as his first human host in exchange for great power. He then returned to Jugdral and used his dark powers to form an army, eventually conquering the entire continent and founding the Loptrian Empire in place of the existing Kingdom of Grann. All rulers after Gair would take his name upon assuming the throne as Emperor, the last being Emperor Gair the Seventeenth, who was slain by the Twelve Crusaders following the Miracle of Darna.
Prince Julius was carefully bred and groomed as his successor by Manfroy and the Loptr Church, and would have re-established this rule, were it not for Seliph's intervention, which resulted in the ultimate destruction of Loptous himself.