During the third century, the denarius was replaced by the double denarius, now usually known as the antoninianus or radiate, which was then itself replaced during the monetary reform of Diocletian which created denominations such as the argenteus ( silver ) and the follis ( silvered bronze ).

The new system consisted of five coins: the aureus / solidus, a gold coin weighing, like its predecessors, one-sixtieth of a pound ; the argenteus, a coin weighing one ninety-sixth of a pound and containing ninety-five percent pure silver ; the follis, sometimes referred to as the laureatus A, which is a copper coin with added silver struck at the rate of thirty-two to the pound ; the radiatus, a small copper coin struck at the rate of 108 to the pound, with no added silver ; and a coin known today as the laureatus B, a smaller copper coin struck at the rate of 192 to the pound.

' Bellows ' appears not to be cognate with the apparently similar Latin follis.

The Edict was reckoned in terms of denarii, although no such coin had been struck for over 50 years ( it is believed that the bronze follis was valued at 12. 5 denarii ).

-All wine merchants who bring wine to the capital ( Constantinopolis ), except Cilicians, have to pay the Dardanelles officials 6 follis and 2 sextarius of wine.

New bronze coins, multiples of the nummus were introduced, such as the 40 nummi ( also known as the follis ), 20 nummi, 10 nummi, and 5 nummi coins ( other denominations were occasionally produced ).

The Byzantine monetary system changed during the 7th century when the 40 nummi ( also known as the follis ), now significantly smaller, became the only bronze coin to be regularly issued.

The follis ( plural folles, later Italian follaro, Arabic fels ) was a type of coin in the Roman and Byzantine traditions.

The Roman follis was a large bronze coin introduced in about 294 ( actual name of this coin is unknown )

The word follis means bag ( usually made of leather ) in latin, and there is evidence that this term was used in antiquity for a sealed bag containing a specific amount of coins.

By the time of Constantine, the follis was smaller and barely contained any silver.

-In the same manner, all merchants of olive-oil, vegetables and lard must pay the Dardanelles officials 6 follis.

Cilician sea-merchants have to pay 3 follis and in addition to that, 1 keration ( 12 follis ) to enter, and 2 keration to exit.

-All wheat merchants have to pay the officials 3 follis per modius, and a further sum of 3 follis when leaving.

The root of the word " fool " is from the Latin follis, which means " bag of wind " or that which contains air or breath.

Although Justinian II ( 685 – 695 and 705 – 711 ) attempted a restoration of the follis size of Justinian I, the follis continued to slowly decrease in size.

Bronze follis of Leo VI the Wise ( r. 886 – 912 ).

A follis of Galerius as caesar.

The name is a corruption of follis, a Roman and later Byzantine copper coin.

Both these views had some truth to them, despite the biases of their authors: Diocletian and the Tetrarchs did greatly expand the army, and the growth was mostly in frontier regions, although it is difficult to establish the precise details of these shifts given the weakness of the sources.

Similarly, in an edict of the Emperor Diocletian from AD 303, which set maximum prices of goods and services, the price of saddles, halters, and bridles are enumerated, as well as the price of a veterinarian for " cutting the hair and hoof of each animal.

Diocletian issued an Edict on Maximum Prices in 301, which attempted to establish the legal maximum prices that could be charged for goods and services.

The Roman Emperor Diocletian tried to set maximum prices for all commodities in the end of the 3rd century CE, but with little success.

For example, Lactantius wrote that Diocletian " by various taxes he had made all things exceedingly expensive, attempted by a law to limit their prices.

* 286 – Emperor Diocletian elevates his general Maximian to co-emperor with the rank of Augustus and gives him control over the Western regions of the Roman Empire.

In his Easter table the year 532 AD was equated with the regnal year 248 of Emperor Diocletian.

Such numbers may have amounted to a substantial proportion, if not all, of the Peucini Bastarnae: Victor claims that the Carpi resettled in Pannonia by Diocletian at the same time, together with those previously transferred by Aurelian, amounted to the entire Carpi tribe.

After the Western Roman Empire collapsed in 476, with the beginning of the Migration Period, Julius Nepos shortly ruled his diminished domain from the Diocletian palace after his 476 flight from Italy.

Diocletian replaced the prefect of Rome with his consular colleague Bassus.

Diocletian refused and fought a battle with them, but was unable to secure a complete victory.

Diocletian's stay in the East saw diplomatic success in the conflict with Persia: in 287, Bahram II granted him precious gifts, declared open friendship with the Empire, and invited Diocletian to visit him.

Bahram II's gifts were widely recognized as symbolic of a victory in the ongoing conflict with Persia ; Diocletian was hailed as the " founder of eternal peace ".

At the conclusion of discussions with the Persians, Diocletian re-organized the Mesopotamian frontier and fortified the city of Circesium ( Buseire, Syria ) on the Euphrates.

This suggestion is unpopular, as it is clear that Diocletian meant for Maximian to act with a certain amount of independence.

In the East, Diocletian engaged in diplomacy with desert tribes in the regions between Rome and Persia.

Diocletian spent the spring of 293 traveling with Galerius from Sirmium ( Sremska Mitrovica, Serbia ) to Byzantium ( Istanbul, Turkey ).

By the end of his reign, Diocletian had secured the entire length of the Danube, provided it with forts, bridgeheads, highways, and walled towns, and sent fifteen or more legions to patrol the region ; an inscription at Sexaginta Prista on the Lower Danube extolled restored tranquilitas at the region.

In early 294, Narseh sent Diocletian the customary package of gifts between the empires, and Diocletian responded with an exchange of ambassadors.

Following some public disputes with Manicheans, Diocletian ordered that the leading followers of Mani be burnt alive along with their scriptures.

Galerius convinced Diocletian that the culprits were Christians, conspirators who had plotted with the eunuchs of the palace.

Diocletian soon grew impatient with the city, as the Romans acted towards him with what Edward Gibbon, following Lactantius, calls " licentious familiarity ".

According to Lactantius, he came armed with plans to reconstitute the Tetrarchy, force Diocletian to step down, and fill the Imperial office with men compliant to his will.

Through coercion and threats, he eventually convinced Diocletian to comply with his plan.

Their homes were distant from political life, but Diocletian and Maximian were close enough to remain in regular contact with each other.