303

Millennium:	1st millennium
Centuries:	3rd century – 4th century – 5th century
Decades:	270s 280s 290s – 300s – 310s 320s 330s
Years:	300 301 302 – 303 – 304 305 306

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303 Media

303 (CCCIII) was a common year starting on Friday of the Julian calendar, the 303rd year of the Common Era (CE) and Anno Domini (AD) designations, the 303rd year of the 1st millennium, the 3rd year of the 4th century, and the 4th year of the 300s decade. As of the start of 303, the Gregorian calendar was 1 day ahead of the Julian calendar, which was the dominant calendar of the time.

Great Persecution: Emperor Diocletian launches the last major persecution of Christians in the Empire. Hierocles is said to have started the fierce persecution of the Christians under Galerius. They are forbidden to worship in groups, and thousands of them are killed in the next 10 years.
February 24 – Galerius publishes his edict that begins the persecution of Christians in his portion of the Empire.
September 25 – On a voyage preaching the gospel, Saint Fermin of Pamplona is beheaded in Amiens, France.
November 28 – Diocletian makes a visit to Rome. The Augusti and the Caesars are united for the first time to celebrate the 20th anniversary of Diocletian's accession.
The Triumphal Arch of Maximian is erected in Salonica.