Decebalus in the context of "Roman Dacia"

Domitian (/dəˈmɪʃən, -iən/ də-MISH-ən, -⁠ee-ən; Latin: Domitianus; 24 October 51 – 18 September 96) was Roman emperor from 81 to 96. The son of Vespasian and the younger brother of Titus, his two predecessors on the throne, he was the last member of the Flavian dynasty. Described as "a ruthless but efficient autocrat", his authoritarian style of ruling put him at sharp odds with the Senate, whose powers he drastically curtailed.

Domitian had a minor and largely ceremonial role during the reigns of his father and brother. After the death of his brother, Domitian was declared emperor by the Praetorian Guard. His 15-year reign was the longest since Tiberius. As emperor, Domitian strengthened the economy by revaluing the Roman coinage, expanded the border defenses of the empire, and initiated a massive building program to restore the damaged city of Rome. Significant wars were fought in Britain, where his general Agricola made significant gains in his attempt to conquer Caledonia (Scotland), and in Dacia (Modern-day Romania), where Domitian was unable to achieve a decisive victory against King Decebalus. Domitian's government exhibited strong authoritarian characteristics. Religious, military, and cultural propaganda fostered a cult of personality, and by nominating himself as perpetual censor, he sought to control public and private morals.

Trajan's Dacian Wars (101–102, 105–106) were two military campaigns fought between the Roman Empire and the Dacians under King Decebalus during the reign of Emperor Trajan. The conflicts stemmed from repeated Dacian incursions into the province of Moesia and from Rome's growing need for resources. Discontent with the treaty Domitian had concluded with Decebalus in 89 CE persisted, and Trajan, keen to assert himself as a soldier-emperor, took the opportunity to reassert Roman authority.

Trajan's First Dacian War began in 101 CE, when the emperor led a major offensive across the Danube using a pontoon bridge constructed by his engineer Apollodorus of Damascus, who also cut a road through the river cliffs. The Romans won a series of victories, including at Tapae and Adamclisi. Before Trajan could capture the Dacian capital, Sarmizegetusa, Decebalus sought peace. The treaty forced him to surrender territory and engineers provided by Domitian, return equipment, accept Roman garrisons, and refrain from crossing the Danube.

The Flavian dynasty, lasting from 69 to 96 CE, was the second dynastic line of emperors to rule the Roman Empire following the Julio-Claudians, encompassing the reigns of Vespasian and his two sons, Titus and Domitian. The Flavians rose to power during the civil war of 69 CE, known as the Year of the Four Emperors; after Galba and Otho died in quick succession, Vitellius became emperor in mid 69. His claim to the throne was quickly challenged by legions stationed in the eastern provinces, who declared their commander Vespasian emperor in his place. The Second Battle of Bedriacum tilted the balance decisively in favor of the Flavian forces, who entered Rome on 20 December, and the following day, the Roman Senate officially declared Vespasian emperor, thus commencing the Flavian dynasty. Although the dynasty proved to be short-lived, several significant historic, economic and military events took place during their reign.

The reign of Titus was struck by multiple natural disasters, the most severe of which was the eruption of Mount Vesuvius in 79 CE, which saw the surrounding cities of Pompeii and Herculaneum be completely buried under ash and lava. One year later, Rome was struck by fire and a plague. On the military front, the Flavian dynasty witnessed the siege and destruction of Jerusalem by Titus in 70 CE, following the failed Jewish rebellion of 66. Substantial conquests were made in Great Britain under the command of Gnaeus Julius Agricola between 77 and 83 CE, while Domitian was unable to procure a decisive victory against King Decebalus in the war against the Dacians. In addition, the Empire strengthened its border defenses by expanding the fortifications along the Limes Germanicus.

Trajan's First Dacian War took place from 101 to 102.

The Kingdom of Dacia, under King Decebalus, had become a threat to the Roman Empire, and defeated several of Rome's armies during Domitian's reign (81–96). Despite the peace treaty established after Domitian's Dacian War, Trajan was set on ridding their new threat to Rome's power and in 101 set out determined to defeat Dacia. After a year of heavy fighting, King Decebalus came to terms and accepted peace.

The Third Battle of Tapae (101) was the decisive battle of the first of Trajan's Dacian Wars, in which the Roman Emperor defeated the Dacian King Decebalus's army. Other setbacks in the campaign delayed its completion until 102. The battle is most likely the battle-scene depicted on Plate 22 of Trajan's column.

It followed the earlier battles at the same place during Domitian's Dacian War.

P. C. Regalianus (died 260/261), known in English as Regalian, was Roman usurper for a few months in 260 and/or 261, during the Crisis of the Third Century, a period of intense political instability in the Roman Empire. Regalian was acclaimed emperor by the troops along the Danube river, a region of the empire that frequently experienced barbarian raids, probably in the hope that he might be able to secure the frontier.

Accounts by surviving literary sources concerning Regalian are brief and few in number, and are mostly considered unreliable. The Historia Augusta relates that he was of Dacian descent, and a descendant of the Dacian king Decebalus, but this is mostly rejected in modern scholarship. Regalianus was married to Sulpicia Dryantilla, a woman from a prestigious senatorial family, which instead points to Regalian also being of high-ranking Roman descent. Regalian's acclamation as emperor was in the wake of a previous usurpation attempt by Ingenuus, also proclaimed by the Danube troops, that had been defeated by emperor Gallienus (r. 253–268). Unlike Ingenuus, and revolutionary for an imperial claimant, Regalian founded his own mint at Carnuntum, his seat of power. He minted coins of himself and his wife, though they were typically of poor quality.