306

Year 306 (CCCVI) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Constantius and Valerius (or, less frequently, year 1059 Ab urbe condita). The denomination 306 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
Events
By place
Roman Empire

Constantius Chlorus undertakes a punitive expedition against the Picts beyond the repaired Hadrian's Wall. His son Constantine I joins him on campaign and they win a brilliant victory.
July 25 – Constantius Chlorus dies outside Eboracum (modern York). Constantine I, age 26, is declared Augustus (emperor) by his troops and awaits recognition by Emperor Galerius.
Galerius grants Constantine I the title Caesar and elevates Severus II to co-emperor of the
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