Many of the rebels were executed; also some of the supporting senators were put to death. The mint of Rome was closed temporarily, and the institution of several other mints caused the main mint of the empire to lose its hegemony. His monetary reformation included the introduction of "antoniniani" containing 5% silver. They bore the mark XXI (or its Greek numerals form KA), which meant that twenty of such coins would contain the same silver quantity of an old silver "denarius". Considering that this was an improvement over the previous situation gives an idea of the severity of the economic situation Aurelian faced. The Emperor struggled to introduce the new "good" coin by recalling all the old "bad" coins prior to their introduction. A very large number of rare gold coins of Aurelian have been discovered as part of the Lava Treasure in Corsica, France, in the 1980s. The deaths of the Sassanid Kings Shapur I (272) and Hormizd I (273) in quick succession, and the rise to power of a weakened ruler (Bahram I), presented an opportunity to attack the Sassanid Empire, and in 275 Aurelian set out for another campaign against the Sassanids. On his way, the Emperor suppressed a revolt in Gaul—possibly against Faustinus, an officer or usurper of Tetricus—and defeated barbarian marauders in Vindelicia (Germany). However, Aurelian never reached Persia, as he was murdered while waiting in Thrace to cross into Asia Minor. As an administrator, Aurelian had been very strict and handed out severe punishments to corrupt officials or soldiers. A secretary of Aurelian (called Eros by Zosimus) had told a lie on a minor issue. In fear of what the Emperor might do, he forged a document listing the names of high officials marked by the emperor for execution and showed it to collaborators. The "notarius" Mucapor and other high-ranking officers of the Praetorian Guard, fearing punishment from the Emperor, murdered him in September 275, in Caenophrurium, Thrace (modern Turkey). Aurelian's enemies in the Senate briefly succeeded in passing "damnatio memoriae" on the Emperor, but this was reversed before the end of the year and Aurelian, like his predecessor Claudius II, was deified as "Divus Aurelianus". There is substantial evidence that Aurelian's wife Ulpia Severina, who had been declared "Augusta" in 274, may have ruled the Empire by her own power for some time after his death.