We know about Eboracum primarily from ancient Roman sources, archaeological evidence, and later historical records. Eboracum was the Roman name for the settlement that is now York in North Yorkshire, England.

• The earliest known mention of Eboracum is by the geographer Ptolemy, who identified it as a city of the Brigantes tribe and the station of the Sixth Legion

• Archaeological finds such as inscriptions, Roman military fortifications, and artifacts confirm Eboracum's existence and importance as a major Roman military base and provincial capital in northern Britain

• The name Eboracum appears on Roman inscriptions discovered in York, with variations like Eburacum also found, indicating its Latinized form of an earlier Celtic name, possibly meaning "place where the yew trees grow" or related to a personal name Eburos

• Historical records note that two Roman emperors died there—Septimius Severus in 211 AD and Constantius Chlorus in 306 AD—highlighting its significance in Roman Britain

• The transition from Eboracum to the modern name York is traced through linguistic changes during Anglo-Saxon and Viking periods, with the name evolving from Eboracum to Evorwic and then to Jorvik before becoming York

Thus, knowledge of Eboracum comes from a combination of classical texts, archaeological excavations, and linguistic studies linking the Roman settlement to the modern city of York