The coin of Maxentius, foe of Constantine, is a "half-follis" which is scarcer than the follis. Maxentius. 306-312 half-follis. 20 mm. 3.13 grams. VICTORIA AETERNA ANG N Victory standing right inscribing shield with VOT X, captive below to left R S RIC Rome 227 "scarce" struck "c. 310" [$59 + $4 shipping in the US] For other ancient coins see my site: http://augustuscoins.com/index.html and for books and catalogs about ancient coins see: http://augustuscoins.com/numislit.html Thanks for looking.