Q:Information: - Theodosius I (11 January 347 17 January 395), also known as Theodosius the Great, was Roman Emperor from AD 379 to AD 395. Theodosius was the last emperor to rule over both the eastern and the western halves of the Roman Empire. On accepting his elevation, he campaigned against Goths and other barbarians who had invaded the empire. He failed to kill, expel, or entirely subjugate them, and after the Gothic War, they established a homeland south of the Danube, in Illyricum, within the empire's borders. He fought two destructive civil wars, in which he defeated the usurpers Magnus Maximus and Eugenius at great cost to the power of the empire. - Magnus Maximus (ca. 335 August 28, 388) was Western Roman Emperor from 383 to 388. - The Massacre of Thessalonica was an atrocity carried out by Gothic troops under the Roman Emperor Theodosius I in 390 against the inhabitants of Thessalonica , who had risen in revolt against the Germanic soldiers . - The Goths were an East Germanic people, two of whose branches, the Visigoths and the Ostrogoths, played an important role in the fall of the Western Roman Empire and the emergence of Medieval Europe. The Goths dominated a vast area, which at its peak under the Germanic king Ermanaric and his sub-king Athanaric possibly extended all the way from the Danube to the Don, and from the Black Sea to the Baltic Sea. - The Danube (, known by various names in other languages) is Europe's second-longest river, after the Volga River, and also the longest river in the European Union region. It is located in Central and Eastern Europe. - The Roman Empire (Koine and Medieval Greek: , tr. ) was the post-Roman Republic period of the ancient Roman civilization, characterized by government headed by emperors and large territorial holdings around the Mediterranean Sea in Europe, Africa and Asia. The city of Rome was the largest city in the world BC AD, with Constantinople (New Rome) becoming the largest around 500 AD, and the Empire's populace grew to an estimated 50 to 90million inhabitants (roughly 20% of the world's population at the time). The 500-year-old republic which preceded it was severely destabilized in a series of civil wars and political conflict, during which Julius Caesar was appointed as perpetual dictator and then assassinated in 44 BC. Civil wars and executions continued, culminating in the victory of Octavian, Caesar's adopted son, over Mark Antony and Cleopatra at the Battle of Actium in 31 BC and the annexation of Egypt. Octavian's power was then unassailable and in 27 BC the Roman Senate formally granted him overarching power and the new title "Augustus", effectively marking the end of the Roman Republic. - The Roman emperor was the ruler of the Roman Empire during the imperial period (starting in 27 BC). The emperors used a variety of different titles throughout history. Often when a given Roman is described as becoming "emperor" in English, it reflects his taking of the title "Augustus" or "Caesar". Another title often used was "imperator", originally a military honorific. Early Emperors also used the title "princeps" (first citizen). Emperors frequently amassed republican titles, notably "Princeps Senatus", "Consul" and "Pontifex Maximus". - A barbarian is a human who is perceived to be either uncivilised or primitive. The designation is usually applied as generalization based on a popular stereotype; barbarians can be any member of a nation judged by some to be less civilised or orderly (such as a tribal society), but may also be part of a certain "primitive" cultural group (such as nomads) or social class (such as bandits) both within and outside one's own nation. Alternatively, they may instead be admired and romanticised as noble savages. In idiomatic or figurative usage, a "barbarian" may also be an individual reference to a brutal, cruel, warlike, insensitive person. - Flavius Eugenius (died 6 September 394) was a usurper in the Western Roman Empire (392394) against Emperor Theodosius I. Though himself a Christian, he was the last Emperor to support Roman polytheism. What entity does 'massacre of thessalonica' has the relation 'instance of' with?
A:
battle