303

303 in other calendars
Gregorian calendar	303; CCCIII
Ab urbe condita	1056
Assyrian calendar	5053
Balinese saka calendar	224–225
Bengali calendar	−290
Berber calendar	1253
Buddhist calendar	847
Burmese calendar	−335
Byzantine calendar	5811–5812
Chinese calendar	壬戌年 (Water Dog); 2999 or 2939; — to —; 癸亥年 (Water Pig); 3000 or 2940
Coptic calendar	19–20
Discordian calendar	1469
Ethiopian calendar	295–296
Hebrew calendar	4063–4064
Hindu calendars
- Vikram Samvat	359–360
- Shaka Samvat	224–225
- Kali Yuga	3403–3404
Holocene calendar	10303
Iranian calendar	319 BP – 318 BP
Islamic calendar	329 BH – 328 BH
Javanese calendar	183–184
Julian calendar	303; CCCIII
Korean calendar	2636
Minguo calendar	1609 before ROC; 民前1609年
Nanakshahi calendar	−1165
Seleucid era	614/615 AG
Thai solar calendar	845–846
Tibetan calendar	阳水狗年; (male Water-Dog); 429 or 48 or −724; — to —; 阴水猪年; (female Water-Pig); 430 or 49 or −723

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

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.

Events

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.