During his reign, he defeated the Alamanni, Goths, Vandals, Juthungi, Sarmatians, Carpi, the Palmyrene Empire and the Gallic Empire

Zenobia's last look on Palmyra, 1888 by Herbert G Schmalz (English, 1856-1935)

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From Wikipedia:

Septimia Zenobia (Palmyrene: 𐡡𐡶𐡦𐡡𐡩 From right to left, letters BETH, TAW, ZAYIN, BETH, YODH: 𐡡𐡶𐡦𐡡𐡩: BTZBY, vocalized as Bat-Zabbai; c. AD 240 – c. 274) was a third-century queen of the Palmyrene Empire in Syria. Many legends surround her ancestry; she was probably not a commoner and she married the ruler of the city, Odaenathus. Her husband became king in 260, elevating Palmyra to supreme power in the Near East by defeating the Sassanians and stabilizing the Roman East. After Odaenathus' assassination, Zenobia became the regent of her son Vaballathus and held de facto power throughout his reign.

In 270, Zenobia launched an invasion that brought most of the Roman East under her sway and culminated with the annexation of Egypt. By mid-271 her realm extended from Ancyra, central Anatolia, to southern Egypt, although she remained nominally subordinate to Rome. However, in reaction to the campaign of the Roman emperor Aurelian in 272, Zenobia declared her son emperor and assumed the title of empress (declaring Palmyra's secession from Rome). The Romans were victorious after heavy fighting; the queen was besieged in her capital and captured by Aurelian, who exiled her to Rome, where she spent the remainder of her life.

Zenobia was a cultured monarch and fostered an intellectual environment in her court, which was open to scholars and philosophers. She was tolerant toward her subjects and protected religious minorities. The queen maintained a stable administration which governed a multicultural multiethnic empire. Zenobia died after 274, and many tales have been recorded about her fate. Her rise and fall have inspired historians, artists and novelists, and she is a patriotic symbol in Syria.

Aurelian, the similarly short-lived Roman Emperor who defeated Zenobia, had an even more impressive resume.  

Aurelian (Latin: Lucius Domitius Aurelianus; 9 September 214 – c. October 275) was a Roman emperor, who reigned during the Third Century Crisis, from 270 to 275. As emperor, he won an unprecedented series of military victories which reunited the Roman Empire after it had nearly disintegrated under the pressure of barbarian invasions and internal revolts.

Born in humble circumstances, near the Danube River, he entered the Roman military in 235, and climbed up the ranks. He would go on to lead the cavalry of the emperor Gallienus, until Gallienus' assassination in 268. Following this, Claudius Gothicus became emperor, until his own death in 270. Claudius' brother, Quintillus ruled the empire for three months, before Aurelian became emperor.

During his reign, he defeated the Alamanni after a devastating war. He also defeated the Goths, Vandals, Juthungi, Sarmatians, and Carpi. Aurelian restored the Empire's eastern provinces after his conquest of the Palmyrene Empire in 273. The following year he conquered the Gallic Empire in the west, reuniting the Empire in its entirety. He was also responsible for the construction of the Aurelian Walls in Rome, the abandonment of the province of Dacia, and monetary reform, trying to curb the devaluation of the Roman currency.