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The clash between Rome and Persia began in the East during the period when Rome was unifying the Mediterranean world. In the 1st century BC, as Rome expanded its influence into Syria and Asia Minor, it bordered Parthia. The two nations competed over Mesopotamia and Armenia, with the Euphrates River serving as a crucial boundary for both powers. In 53 BC, Rome's Crassus invaded Parthia but suffered a crushing defeat at the Battle of Carrhae and was killed. Even after this, Rome and Parthia clashed multiple times over the Armenian throne and the defense of Syria. However, neither side could completely conquer the other. The vast territories in the East, logistical challenges, and the formidable cavalry forces led to a prolonged conflict. This rivalry continued even after the establishment of the Roman Empire, eventually leading to more intense wars with the Sasanian dynasty, which succeeded Parthia.

The Roman-Dacian Wars were a conflict where Trajan significantly expanded the empire's northern border and incorporated the Kingdom of Dacia into a Roman province. In the First War (101-102 AD), Rome forced Decebalus to surrender but couldn't completely eliminate Dacia's independence. When Decebalus rebuilt his military strength, Trajan launched a second expedition in 105 AD and conquered Dacia by capturing Sarmizegetusa in 106 AD. Rome built roads, forts, and cities in the region, stationed legions, and secured gold and silver. The conquest of Dacia greatly enlarged the Roman Empire's territory and enhanced Trajan's authority. The war's events are detailed in the reliefs on Trajan's Column, showcasing contemporary weapons, battles, and military marches. However, defending the expanded borders required substantial troops, and threats from surrounding tribes persisted. Eventually, amidst the Crisis of the Third Century, Emperor Aurelian withdrew from Dacia. Nevertheless, the Latin language and institutions spread during Roman rule left significant traces on the region's subsequent history and culture.

The outcome of the Roman-Dacian Wars left a significant impact not only on military and economic aspects but also on the history of the region that is now Romania. Through two wars in 101-102 AD and 105-106 AD, Rome conquered the kingdom of Decebalus and incorporated Dacia into the empire as a province. Subsequently, as Romans and settlers from various regions established themselves, Latin language, Roman institutions, and lifestyles spread. Roman rule lasted until the 3rd century before withdrawing under pressure from the north. The linguistic and cultural influences from the Roman era persisted. The wars also served as a testament to Rome's military prowess. Trajan organized a large army, constructed bridges and roads across the Danube, and conquered the mountain kingdom through prolonged sieges. In contrast, Decebalus organized strong resistance to defend Dacia's independence. While both wars ultimately ended in Roman victory, the conquest of Dacia was an event that showcased both the expansion and the limitations of the Roman Empire. It demonstrates Trajan's campaigns contributing to the empire's expansion.

Trajan's conquest of Dacia was the most significant military achievement of his reign and held a crucial position as the Roman Empire's territory approached its zenith. By conquering Dacia, Rome secured a vast region north of the Danube and abundant mineral resources. The immense spoils of war aided Rome's finances, which Trajan used to construct forums, markets, roads, and public buildings. Trajan's Column also commemorated this conquest. However, conquering Dacia did not resolve all of Rome's border issues. Numerous tribes remained to the north, requiring Roman military defense. Subsequent emperors had to bear the costs of this defense. Especially as the empire faced various crises in the 3rd century, the burden of maintaining Dacia grew. Eventually, in the 270s, Emperor Aurelian withdrew Roman troops and administrative bodies from Dacia. Thus, the massive forward base established by Trajan in the north was freed from direct Roman rule after approximately 160 years.

Rome's conquest of Dacia was not merely the subjugation of a kingdom but a significant alteration of the empire's border structure. While the Danube River remained a crucial defensive line, the province of Dacia, situated north of the river, extended Roman territory deep into the Carpathian Mountains. Rome stationed legions and auxiliary troops and improved its road network to secure this region. Military roads connected fortresses and cities, facilitating the rapid movement of troops and supplies. Furthermore, the gold and silver extracted from Dacia's mines contributed to the empire's economy. The establishment of Roman-style cities and administrative bodies brought changes to the existing Dacian society. As Romans and settlers from other regions established themselves, languages and cultures intermingled, laying the foundation for the formation of Latinate culture. However, even after the conquest, tensions on the Dacian frontier did not completely disappear. Rome had to manage relations with various northern tribes, and wars continued on other imperial frontiers. While Dacia expanded territory and wealth, it also imposed a defensive burden.

With the completion of the Dacian conquest, the Roman Empire secured a strategic position in the Carpathian Mountains and the Danube River region. Trajan introduced the Roman administrative system and established military bases in the conquered territories, organizing the new province of Dacia. Roman legions and settlers entered Dacia, and Romanization progressed with the construction of roads, forts, and cities. Dacia's gold and silver mines also contributed to Roman finances. Trajan utilized the resources and spoils of war acquired during the conquest to expand public works and military facilities. Cities adopted Roman administration and culture, and Latin gradually spread. The Roman territory significantly expanded north of the Danube River, leading to a readjustment of the border defense lines. However, Dacia was isolated further north than other regions of the Roman Empire, making its defense costly. Constant contact with various surrounding tribes was necessary, and troops were required to counter forces crossing the Danube. Therefore, the conquest of Dacia was an event that brought both economic benefits and strategic burdens.

In 106 AD, the Roman army besieged Sarmizegetusa, the capital of Dacia, and launched a full-scale assault. The Dacian army fiercely resisted, utilizing the city walls and mountainous terrain, but struggled to withstand the relentless Roman attacks. The Romans cut off the water supply to the capital and pressured the walls, gradually weakening the defenders. Eventually, Sarmizegetusa fell, and Decebalus fled the capital to the mountainous regions. He attempted to regroup and continue his resistance, but he could not evade the Roman pursuit. Ultimately, to avoid capture, Decebalus took his own life. His death effectively marked the end of organized Dacian resistance, and the Kingdom of Dacia was conquered by Rome. Trajan seized key Dacian fortresses and cities, stationing Roman troops. The victory greatly enhanced Trajan's reputation, and celebrations were held in Rome to commemorate the event. The Column of Trajan in Rome was adorned with bas-reliefs depicting scenes from the war, which remain important historical records to this day.

In 105 AD, Trajan attacked Dacia again, and this war became a battle that would determine the very existence of the Dacian kingdom. The Roman army crossed the Danube River and advanced through multiple routes, pressuring Dacia's defenses. Although Decabalus attempted to slow the Roman advance using mountainous terrain and fortresses, the Roman army, equipped with siege engines and engineering units, systematically dismantled each defensive position. As the Roman advance continued, the defensive lines around Sarmizegetusa, the Dacian capital, gradually collapsed. Decabalus attempted several counterattacks to halt the Roman advance, but failed to decisively turn the tide. The Dacian army also attacked Roman supply lines and burned surrounding areas, but Rome maintained an organized supply system. Trajan besieged the capital, intensifying pressure on Dacia's final resistance. As the battle dragged on, the Dacian army's manpower and food supplies dwindled, and the fall of the capital loomed. The final phase of the war led to fierce battles surrounding Sarmizegetusa.

After the war ended in 101 AD, Dacia became nearly a vassal state of Rome, but Decebalus did not properly adhere to the peace terms. He regrouped surrounding tribes, restored fortresses, and secured weapons and troops. Rome also strengthened its military facilities to stabilize the Danube frontier. Trajan took the possibility of Decebalus attacking again very seriously and ultimately prepared for a new war. This time, the plan was not just border defense but the complete conquest of the Dacian kingdom. Rome constructed a massive stone bridge over the Danube River, allowing for the swift movement of troops and supplies. This bridge, known to be designed by Apollodorus, was a prime example of Rome's superior civil engineering. Dacia also intensified its defensive preparations, focusing on its capital and mountain fortresses. As the two nations entered full-scale conflict again, a clash far larger than the first war was foreshadowed. Finally, in 105 AD, Trajan crossed the Danube with a large army.

In 101 AD, Trajan led a large Roman army across the Danube River to invade Dacia. The Roman forces advanced from multiple directions, pressuring Dacia's defenses, while engineers constructed roads and bridges through mountainous terrain. The Dacians resisted using guerrilla tactics and fortress defenses, but struggled to completely halt the Roman army's organization and supply capabilities. Trajan slowly advanced towards Dacia's capital, Sarmizegetusa, and Decebalus reinforced the defenses around the city. As the war continued, both sides suffered heavy casualties, but the Romans gradually captured key strongholds. Eventually, Decebalus accepted surrender and signed a peace treaty with Rome. Dacia remained an independent state but had to accept various terms, including submission to Rome and limitations on its weaponry. Trajan returned to Rome to celebrate his victory, but Dacia's power was not entirely eliminated. Decebalus began to reassemble his forces. At this point, Rome had not completely subdued Dacia. The war was temporarily paused.