A millennium (pl. millennia) is a period of time equal to one thousand years (from Latin mille, thousand, and annum, year).
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1st millennium BC - 1st millennium - 2nd millennium In the Gregorian calendar, the 1st millennium is the period of one thousand years that commenced with the year 1 of the Common Era. There is no "year zero" in the Gregorian calendar.
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Upper Paleolithic
• 10th millennium BC | 9th millennium BC | 8th millennium BC
• 7th millennium BC | 6th millennium BC | 5th millennium BC

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The 3rd century is the period from 201 to 300 in accordance with the Julian calendar in the Christian Era.

Overview

After the death of Commodus in the previous century the Roman Empire was plunged into a civil war.
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As a means of recording the passage of time, the 4th century (per the Julian/Gregorian calendar and Anno Domini era) was that century which lasted from 301 to 400.

Overview

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list of decades which have articles with more information about them.

During the twentieth century, it became popular to look at that century's decades as historical entities in themselves.
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Centuries: 2nd century - 3rd century - 4th century

230s 240s 250s - 260s - 270s 280s 290s
260 261 262 263 264
265 266 267 268 269

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Events and Trends

• Crisis of the Third Century

Significant people

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Centuries: 2nd century - 3rd century - 4th century

240s 250s 260s - 270s - 280s 290s 300s
270 271 272 273 274
275 276 277 278 279

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Events and Trends

• Crisis of the Third Century

Significant people

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Centuries: 2nd century - 3rd century - 4th century

250s 260s 270s - 280s - 290s 300s 310s
280 281 282 283 284
285 286 287 288 289

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Events and Trends

• Around 285 Saint Antony retired to a hermits life in the Egyptian desert.

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Centuries: 2nd century - 3rd century - 4th century

270s 280s 290s - 300s - 310s 320s 330s
300 301 302 303 304
305 306 307 308 309

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Events and Trends

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Centuries: 3rd century - 4th century - 5th century

280s 290s 300s - 310s - 320s 330s 340s
310 311 312 313 314
315 316 317 318 319

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Events and Trends

Significant people

• Constantine, Roman Emperor

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Centuries: 3rd century - 4th century - 5th century

290s 300s 310s - 320s - 330s 340s 350s
320 321 322 323 324
325 326 327 328 329

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Events and Trends

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3rd century - 4th century
260s  270s  280s  - 290s -  300s  310s  320s
287 288 289 - 290 - 291 292 293
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3rd century - 4th century
260s  270s  280s  - 290s -  300s  310s  320s
288 289 290 - 291 - 292 293 294
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3rd century - 4th century
260s  270s  280s  - 290s -  300s  310s  320s
289 290 291 - 292 - 293 294 295
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3rd century - 4th century
260s  270s  280s  - 290s -  300s  310s  320s
290 291 292 - 293 - 294 295 296
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3rd century - 4th century
260s  270s  280s  - 290s -  300s  310s  320s
291 292 293 - 294 - 295 296 297
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3rd century - 4th century
260s  270s  280s  - 290s -  300s  310s  320s
292 293 294 - 295 - 296 297 298
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3rd century - 4th century
260s  270s  280s  - 290s -  300s  310s  320s
293 294 295 - 296 - 297 298 299
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3rd century - 4th century
260s  270s  280s  - 290s -  300s  310s  320s
294 295 296 - 297 - 298 299 300
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3rd century - 4th century
260s  270s  280s  - 290s -  300s  310s  320s
295 296 297 - 298 - 299 300 301
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3rd century - 4th century
260s  270s  280s  - 290s -  300s  310s  320s
296 297 298 - 299 - 300 301 302
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Diocletian
Emperor of the Roman Empire

Diocletian
Reign November 20 284 - 286 (alone);
286 - May 1 305 (as Augustus of the East, with Maximian as Augustus of the West)
Full name Gaius Aurelius Valerius Diocletianus

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Maximian
Caesar then Augustus of the west

Coin featuring Maximian
Reign 285-6 (as Caesar under Diocletian);
1 March 286 - 1 May 305 (as Augustus of the west, with Diocletian as Augustus in the east)
306 and 310 (declared himself Augustus)

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