Billon coinage of Persia and Iran
Debased silver alloys struck in periods of monetary strain. 4 catalogued examples spanning Parthian (Arsacid) Empire, Arab-Sasanian & Early Islamic.
In short
Billon is silver deliberately alloyed down with copper — usually below 50% fine — and in Iranian numismatics it marks the moments when a state kept the look of a silver coinage while quietly removing the silver from it. Billon accounts for 4 of the catalogued Persian and Iranian pieces, spanning 32 BCE – 1034 CE. Debased silver alloys struck in periods of monetary strain. Denominations struck in this material include Drachm, Tetradrachm, Dirham.
- Catalogued
- 4
- Eras
- 2
- Metals
- 1
- Denominations
- 3
Key facts
| Catalogued pieces | 4 |
|---|---|
| Date range | 32 BCE – 1034 CE |
| Eras represented | Parthian (Arsacid) Empire, Arab-Sasanian & Early Islamic |
| Metals | Billon |
| Denominations | Drachm, Tetradrachm, Dirham |
| Mints | Ecbatana, Seleucia on the Hedyphon (Khuzestan), Spasinou Charax (mouth of the Tigris), Samarqand |
| Issuers | Vologases VI, Kamnaskires V of Elymais, Attambelos I of Characene, Qadir Khan Yusuf |
| Definition | Silver–copper alloy, typically under 50% fine silver |
| Typical contexts | Late Parthian, post-Ilkhanid, late Safavid/Afsharid strain |
| Identification | Grey-brown tone, copper flash on high points |
| Specific gravity | Well below 10.5 g/cm³ of fine silver |
Why billon appears
Debasement is a fiscal instrument, not an accident. When bullion supply tightened or war spending outran revenue, mints held the coin's name, weight and types constant and lowered its fineness. Late Parthian drachms, several Ilkhanid and post-Ilkhanid issues, and some late Safavid and Afsharid provincial silver drift into billon in exactly this way.
Because the design is unchanged, billon pieces are frequently sold as ordinary silver. Colour is the fastest tell: billon tones to a grey-brown or coppery cast rather than the black-to-slate patina of high-fine silver, and worn high points often show a reddish copper flash.
Collecting billon
Billon issues are historically valuable precisely because they date monetary crises. A dated debased series lets you plot, coin by coin, the finances of a dynasty in decline — evidence no chronicle supplies as precisely.
Prices are modest, so condition matters more than metal. Look for full legends and an unbroken flan; billon is brittle and edge cracks are common. Avoid aggressive cleaning, which strips the surviving surface silver and leaves an unmistakable pink coin.
Parthian (Arsacid) Empire · 247 BCE – 224 CE
Era overview →Arab-Sasanian & Early Islamic · 651 – 1258 CE
Era overview →Frequently asked about Billon
- Is billon a real silver coin?
- Yes, but only partly: billon is a silver–copper alloy usually below 50% fine. It was issued as silver money at silver face value, which is why debasement was profitable for the issuing state.
- How do I tell billon from silver?
- Weigh it and look at the colour. Billon is lighter for its size than fine silver, tones brown-grey rather than slate-black, and shows copper-red on rubbed high points.
- What is a Billon?
- Billon accounts for 4 of the catalogued Persian and Iranian pieces, spanning 32 BCE – 1034 CE. Debased silver alloys struck in periods of monetary strain. Denominations struck in this material include Drachm, Tetradrachm, Dirham.
- How many Billon pieces are catalogued on Persian Treasury?
- 4 items, dated 32 BCE – 1034 CE, spread across 2 eras: Parthian (Arsacid) Empire, Arab-Sasanian & Early Islamic.
- Which metals were used for Billon coinage?
- Billon. Each entry records the metal, the approximate weight where known, and a cited reference.
- Which denominations are associated with Billon?
- Drachm, Tetradrachm, Dirham. Every denomination has its own reference page with dated examples.
- Where were Billon coins minted?
- Recorded mints include Ecbatana, Seleucia on the Hedyphon (Khuzestan), Spasinou Charax (mouth of the Tigris), Samarqand.