Sol Invictus and Christmas
- Encyclopedia Britannica (2006) - Sol
- http://penelope.uchicago.edu/~grout/encyclopaedia_romana/calendar/invictus.html
- http://www.simpletoremember.com/vitals/Christmas_TheRealStory.htm
- http://penelope.uchicago.edu/~grout/encyclopaedia_romana/calendar/saturnalia.html
Sol, Mithras, and Elagabalus
- http://mythology.wikia.com/wiki/Sol_Invictus
- http://www.roman-empire.net/decline/elagabalus.html
- http://www.roman-empire.net/religion/sol.html
- http://www.tertullian.org/rpearse/mithras/display.php?page=main#Sol,_Helios,_Sol_Invictus
Sol Invictus and the Roman Emperors
- http://www.luc.edu/roman-emperors/aurelian.htm
- http://sp88k.home.xs4all.nl/Coin/Traveler/Deities/SolInvictvs.htm
- http://rome101.com/Topics/ArchConstantine/Tour/thumb/EEndRoundel_T.jpg
- http://penelope.uchicago.edu/~grout/encyclopaedia_romana/calendar/invictus.html
- http://thenewholybible.org/Constantine_coin.jpg
- http://houseofconstantinecoins.reidgold.com/Sol_other.html
- http://upload.wikimedia.org/wikipedia/commons/e/ef/Disc_Sol_BM_GR1899.12-1.2.jpg