Macrinus Denarius
- Details of the reign of Macrinus who proved that cutting the pay of the men with swords who support you is a bad idea.
- http://www.garstang.us/emperors/macrinus.htm

Marcus Opellius Macrinus
- Details about the life and times of this short reigned Roman Emperor.
- http://www.roman-empire.net/decline/macrinus.html

Macrinus (Coins and Biography)
- Gives details and pictures of the coins Macrinus had minted as well as a brief biography of his life.
- http://www.lawrence.edu/dept/art/buerger/catalogue/115.html

Macrinus
- Provides a biography of the life and reign of this Roman Emperor.
- http://www.roman-emperors.org/macrinus.htm