211 to 217 – Emperor Caracalla
Reign of the cruel and corrupt Roman Emperor Caracalla.
Caracalla grants citizenship to communities throughout the Empire.
224 to 651 – The Sassanids
Ardashir overthrows Ardavan, the last of the Parthian kings, and founds the Sassanid
Dynasty, ruling a new Persian Empire. Zoroastrianism becomes the state religion.
The Sassanids, descended from the Achaemenids (see Cyrus the Great 558 B.C.E.), maintain the Persian Empire and hold off the Romans until defeated by Arab warriors.
235 – Rome Under Threat
As the Roman Empire comes under increasing threat, the political tensions in Rome also increase.
250 – Axum Empire
The beginning of the Axum Empire in Ethiopia, which will have prosperous cities along the major trade route of the Red Sea.
The Goths invade the Balkans.
260 – Sharpur of Persia
The Roman Emperor Valerian (193 to 260) is defeated by Shapur of Persia at Edessa and dies in captivity.
268 to 273 – Queen Zenobia
Queen Zenobia of Palmyra conquers parts of the Roman Empire in the Middle East.
270 to 275 – Roman Emperor Aurelian
Emperor Aurelian, who rose from being an ordinary soldier, abandons Dacia (northwest Romania) to the Gothic tribes.
284 to 305 – Roman Emperor Diocletian
Roman Emperor Diocletian reorganizes the empire, dividing power between himself and three others (the Tetrarchy). Christians suffered much persecution during his rule.
286 – East / West Roman Empires
In the face of the growing number of attacks on the empire, Diocletian divides it in two. He appoints Maximian as his co-emperor to rule the western half, while he rules the eastern half.
287 – St Maurice
The martyrdom of St Maurice and the Theban Legion.
300 – Decline of the Roman Empire
The Roman Empire declines in the face of barbarian incursions.
Stirrups are invented in China but would take time to reach Europe. Mounted warriors can now use swords and spears more effectively on horseback.