Britannia Superior (Latin for "Upper Britain") was a province of Roman Britain created after the civil war between Septimius Severus and Claudius Albinus. Although Herodian credits Severus with dividing Roman Britain into the Northern territory of Britannia Inferior and the Southern territory of Britannia Superior, modern scholarship argues that it is more likely that Caracella was the person who made the split sometime in the early 3rd century CE. The previous British capital Londinium remained the centre of Britannia Superior while Eboracum, or modern York was the capital of Britannia Inferior. Epigraphical evidence shows that Upper Britain encompassed approximately what is now Wales, southern England and East Anglia. However, the official boundary between Britannia Superior and Inferior is still unclear. Although Londinium went through a period of decline during this time, the province as a whole continued to be developed. Villas were expanded and a new wall around the capital was created. Governors of Britannia Superior are difficult to trace and it is hard to decipher exactly when the province became distinct from its twin Britannia Inferior. Also, little information about their system of governance or their peoples exist today. However, some archeological research of Britannia Superior leads historians to believe that Romano-British relations may have to be restudied with a more modern approach. Due to instability within the Roman Empire, reforms by Diocletian and Carausius' usurping total provincial power in the late 3rd century, the province was restructured by Constantius early in the 4th century. Build up and civil war After the murder of Emperor Commodus on 31 December 192 AD, Pertinax was chosen by Commodus' conspirators as a suitable replacement for the title of Roman ruler. He would be the first of five Emperors during 193AD, known as the tumultuous Year of the Five Emperors. During this year, the leader of the Roman Empire was to be decided within a civil war between its three largest military forces. This civil war was contested by Clodius Albinus in Britain, Septimius Severus in the Danube and Syrian leader Pescinnius Niger. Following the murder of Pertinax by his own guard on 28 March 193 AD Severus and Albinus swore an alliance as shown on the altar Ostia. The altar shows that all names (including Albinus') apart from Severus' have been etched out of the inscription. This is evidence that Severus eventually become the victor of the civil war. During the alliance