Excerpts from Books and Wikipedia
"In four years, Aurelian had secured the frontiers of the Empire and reunified it, effectively giving the Empire a new lease on life that lasted 200 years. , , , Aurelian strengthened the position of the Sun god Sol Invictus as the main divinity of the Roman pantheon. His intention was to give to all the peoples of the Empire, civilian or soldiers, easterners or westerners, a single god they could believe in without betraying their own gods. The center of the cult was a new temple, built in 274 and dedicated on December 25 of that year in the Campus Agrippae in Rome, with great decorations financed by the spoils of the Palmyrene Empire." [Wikipedia]