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Reign: 27 BC - AD 14; Major accomplishments: Founded the Roman Empire and became its first Emperor, initiated the Pax Romana.

Reign: AD 14 - 37; Major accomplishments: Consolidated the empire's frontiers, efficient administration.

Reign: AD 37 - 41; Major accomplishments: Noted for his tyranny and extravagance, began construction of two aqueducts in Rome.

Reign: AD 41 - 54; Major accomplishments: Conquest of Britain, construction of major public works.

Reign: AD 54 - 68; Major accomplishments: Known for his artistic endeavors, persecution of Christians, and a great fire in Rome.

Reign: AD 69 - 79; Major accomplishments: Began construction of the Colosseum, restored stability after the Year of the Four Emperors.

Reign: AD 79 - 81; Major accomplishments: Completed the Colosseum, dealt with the eruption of Mount Vesuvius and a fire in Rome.

Reign: AD 81 - 96; Major accomplishments: Strengthened the economy, expanded and fortified the borders, rebuilt and adorned temples.

Reign: AD 98 - 117; Major accomplishments: Presided over the greatest military expansion in Roman history, constructed Trajan's Market and Trajan's Column.

Reign: AD 117 - 138; Major accomplishments: Built Hadrian's Wall in Britain and the Pantheon in Rome, consolidated and beautified the empire.

Reign: AD 138 - 161; Major accomplishments: Era of peace and prosperity known as the Pax Romana, legal and economic reforms.

Reign: AD 161 - 180; Major accomplishments: Known as the philosopher king, wrote 'Meditations', military campaigns against Germanic tribes.

Reign: AD 180 - 192; Major accomplishments: Ended the northern military campaigns, period of decline, notorious for his erratic behavior.

Reign: AD 193 - 211; Major accomplishments: Founded the Severan dynasty, military campaigns in Africa and Britain.

Reign: AD 211 - 217; Major accomplishments: Issued the Constitutio Antoniniana granting citizenship to all free men within the empire, notable for the baths of Caracalla in Rome.

Reign: AD 284 - 305; Major accomplishments: Stabilized the empire through the tetrarchy system, extensive administrative division, and persecution of Christians.

Reign: AD 306 - 337; Major accomplishments: First Christian emperor, established Constantinople as the new capital, issued the Edict of Milan granting religious toleration.

Reign: AD 361 - 363; Major accomplishments: Attempted to restore paganism as the state religion, military campaigns against the Persians.

Reign: AD 364 - 375; Major accomplishments: Stabilized the western frontier, enacted laws protecting the peasantry.

Reign: AD 379 - 395; Major accomplishments: Made Christianity the state religion of the Roman Empire, last emperor to rule both east and west halves of the empire.

Reign: AD 395 - 423; Major accomplishments: Reign is noted for the Visigothic sacking of Rome, presided over the decline of the Western Roman Empire.

Reign: AD 475 - 476; Major accomplishments: Last emperor of the Western Roman Empire, his deposition by Odoacer traditionally marks the end of the Western Roman Empire.

Reign: AD 96 - 98; Major accomplishments: Began the adoption of heirs, restored freedom of speech, launched public welfare program ('alimenta').

Reign: AD 161 - 169; Major accomplishments: Co-emperor with Marcus Aurelius, victories in the Parthian War that secured the empire's eastern border.

Reign: First reign: AD 286 - 305, second reign: AD 306 - 308; Major accomplishments: Co-emperor with Diocletian, suppressed revolts and fought against foreign invasions.

Reign: AD 305 - 311; Major accomplishments: Initially a persecutor of Christians, late in his reign issued an edict which granted Christians the right to practice their religion.

Reign: AD 270 - 275; Major accomplishments: Reunited the Roman Empire by defeating the Gallic and Palmyrene Empires, began construction of the Aurelian Walls in Rome.

Reign: AD 276 - 282; Major accomplishments: Restored peace and security to the Roman Empire, initiated major public works, and promoted viticulture.

Reign: AD 218 - 222; Major accomplishments: Introduced the worship of the Syrian sun god Elagabalus to Rome, known for religious and social reforms.

Reign: AD 249 - 251; Major accomplishments: First emperor to be killed in battle against the Goths, initiated the first empire-wide persecution of Christians.

Reign: AD 253 - 260; Major accomplishments: Captured in battle by the Sassanid emperor, attempted reforms to recover the troubled Roman empire.