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Roman Coin Denominations :

Relative Sizes and Values

This is just what I have compiled via the internet.  There were more types than stated here !!


Early Republic ( > 290 bc)


Coin Value Metal Thus
As 12 Uncia Bronze
Semis 6 Uncia Bronze
Triens 4 Uncia Bronze
Quadrans 3 Uncia Bronze
Sextans 2 Uncia Bronze
Uncia Base Unit Bronze Fell into disuse in the empire, resurged briefly during Hadrian.

From Augustus to Caracalla (27 bc - 217 ad)


Coin Value Metal Weight Diameter Thus
         
Aureus 25 denarii Gold 7,85 gr. 20 mm A war-financing coin. Later debased.
Quinarius 12.5 denarii Gold 4 gr. 15 mm
Denarius 16 asses 4,5  gr (rep.) -  
2,3 gr (carac.)
of Silver
3,8 gr. 19 mm 1st struck at 216 bc valued at 10 asses. Around 118 bc revalued (see left). Very accessible coin. In disuse after 240 bc.
Quinarius 8  asses Silver 2 gr. 15 mm
Sestertius 4  asses Bronze 25-30 gr. 25-35 mm Biggest coin (lit.). 'The' coin of preference for valueing for example an estate.
Dupondius 2 asses Bronze 12 gr. 28 mm Sometimes in Orichalcum (mustardly bronze)
As 4 Quadrans Bronze 11 gr. 24-28 mm Had tin added, giving it a reddish hue.
Semis 2 Quadrans Bronze 3-4 gr. 18 mm Sort of the 'small change' of it's day.
Quadrans - - Bronze 3 gr. 15 mm Generally with a symbol instead of a 'head'.
 

During Caracalla and later ( 220 - 300 ad )


Coin Value Metal Weight Diameter Thus
         
Antonianus 2 Denarii
(at start)
60 % silver
(at start)
1,6 times a denarius 15-18 mm Intro'd by Caracalla. Made famous by the army- emperors. Commonly called  'Radiate'. 

Extra: The coin was introduced by Caracalla wearing the radiate crown, signifying it as valued at twice as much (though it's weight was only max. 1,6 as much). Though at start the coin consisted of 60%  silver this deteriorated steadily to fund the (internal) wars. After the capture of Gallienus' father G. minted  more than a million a day (!). By now the coiners had stopped lessening the silver % an heightening the mix of bronze and tin. Now the flans were of a 5-10% silver and then pickled so that the copper on the surface of the coin was leached away. When struck these coins generally had such a thin silver layer that it rapidly wore away. Aurelian (270 ad) tried a monetary reform in which the Antonianus was put at a 20 parts to 1 part alloy (thus the XXI sometimes found on a coin). Bu this did not hold (as Aurelian didn't). The Antonianus met the end of its product life-cycle with Diocletian (300 ad).

Diocletianic Reforms ( about 300 ad)


Coin Value Metal Weight Diameter Thus
Aureus  - - Gold Weight and Diameter fluctuated too much
Argenteus 1/24 Aureus Silver Weight and Diameter fluctuated too much
Follis 1/5 Argentii or
10 Radiates
2-5% Silver (rest Bronze) 18-24 mm Morphed into AE3 
Radiate 1 Antoninianus Bronze Weight and Diameter fluctuated too much

Constantine unto The Fall (330 - 450 ad)


Coin Value Metal Weight Diameter Thus
Solidus

24 Siliquae

Gold 4.5 gm   A nearly pure renewed Aureus
Semissis 12 Siliquae Gold 2.25 gm
Scripulum 9 Siliquae Gold 1.7 gm
Miliarense 1/18 Solidus Silver 4.5 gm Prior to Constantine the Argenteus
Siliqua 1/24 Solidus Silver 3.4 gm Sort of debased Denarius
AE 1 Unknown Bronze > 25 mm
AE 2 Unknown Bronze 3 - 6 gm 21-25 mm Disappear with the fall of the Constantinians
AE 3 Unknown Bronze 1,25 - 3gm 17-21 mm Sometimes have a silver wash
AE 3/4 Unknown Bronze 1,25 - 3gm 16-18 mm a LOT of 'Gloria Excercitvs'. Not everybody agrees with typing this as AE 3/4
AE 4 Unknown Bronze 1 - 3gm < 16 mm

Greek & Greek Imperial Coins


Coin Value Metal Weight Diameter Thus
Mean of me but simple. Generally called as it's Diameter, thus an AE22 is 22 mm, an AE 13 is 13 etc.

 

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