Here is a substantial collection of (subject, predicate, object) triples about the Roman Empire:

## Founding & Origins
- (Roman Empire, succeeded, Roman Republic)
- (Roman Republic, ended in, 27 BC)
- (Augustus, founded, Roman Empire)
- (Augustus, was, first Roman Emperor)
- (Augustus, was born as, Gaius Octavius)
- (Augustus, was adopted by, Julius Caesar)
- (Julius Caesar, was assassinated in, 44 BC)
- (Battle of Actium, occurred in, 31 BC)
- (Octavian, defeated, Mark Antony)
- (Octavian, defeated, Cleopatra)

## Geography
- (Roman Empire, was centered on, Mediterranean Sea)
- (Romans, called Mediterranean, Mare Nostrum)
- (Roman Empire, included, Italy)
- (Roman Empire, included, Gaul)
- (Roman Empire, included, Hispania)
- (Roman Empire, included, Britannia)
- (Roman Empire, included, Egypt)
- (Roman Empire, included, Greece)
- (Roman Empire, included, Asia Minor)
- (Roman Empire, included, North Africa)
- (Roman Empire, included, Judea)
- (Roman Empire, reached greatest extent under, Trajan)
- (Roman Empire, reached greatest extent in, 117 AD)
- (Rome, was capital of, Roman Empire)
- (Constantinople, became capital in, 330 AD)
- (Hadrian's Wall, was built in, Britannia)

## Government & Politics
- (Emperor, ruled, Roman Empire)
- (Senate, advised, Emperor)
- (Praetorian Guard, protected, Emperor)
- (Praetorian Guard, sometimes assassinated, Emperors)
- (Provinces, were governed by, Governors)
- (Roman law, influenced, modern legal systems)
- (Twelve Tables, were, early Roman law code)
- (Justinian Code, codified, Roman law)
- (Cursus honorum, was, Roman political career path)

## Notable Emperors
- (Augustus, reigned, 27 BC – 14 AD)
- (Tiberius, succeeded, Augustus)
- (Caligula, was assassinated by, Praetorian Guard)
- (Claudius, conquered, Britannia)
- (Nero, blamed Christians for, Great Fire of Rome)
- (Nero, committed, suicide)
- (Vespasian, founded, Flavian dynasty)
- (Titus, destroyed, Second Temple)
- (Trajan, expanded empire to, greatest extent)
- (Hadrian, built, Hadrian's Wall)
- (Marcus Aurelius, wrote, Meditations)
- (Marcus Aurelius, was, Stoic philosopher)
- (Commodus, ended, Pax Romana)
- (Diocletian, established, Tetrarchy)
- (Constantine, legalized, Christianity)
- (Constantine, founded, Constantinople)
- (Theodosius I, made Christianity, state religion)
- (Theodosius I, was, last emperor of unified empire)

## Military
- (Roman Legion, was, primary military unit)
- (Legion, contained approximately, 5000 soldiers)
- (Legionary, carried, gladius)
- (Legionary, carried, pilum)
- (Legionary, carried, scutum)
- (Centurion, commanded, century)
- (Roman army, used, testudo formation)
- (Auxilia, supplemented, Legions)
- (Roman navy, was called, Classis)

## Society & Culture
- (Latin, was, official language)
- (Greek, was widely spoken in, Eastern Empire)
- (Roman religion, was originally, polytheistic)
- (Jupiter, was king of, Roman gods)
- (Romans, adopted gods from, Greeks)
- (Vestal Virgins, tended, sacred fire)
- (Slavery, was common in, Roman society)
- (Patricians, were, aristocratic class)
- (Plebeians, were, common citizens)
- (Equestrians, were, wealthy non-senatorial class)
- (Roman citizenship, conferred, legal rights)
- (Caracalla, extended citizenship to, all free inhabitants)
- (Toga, was, formal Roman garment)
- (Gladiators, fought in, Colosseum)
- (Chariot races, were held in, Circus Maximus)

## Architecture & Engineering
- (Romans, built, aqueducts)
- (Romans, invented, concrete)
- (Romans, built, roads)
- (All roads, lead to, Rome)
- (Colosseum, was built in, Rome)
- (Colosseum, was completed in, 80 AD)
- (Pantheon, has, largest unreinforced concrete dome)
- (Roman Forum, was, civic center of Rome)
- (Appian Way, was, famous Roman road)
- (Romans, built, public baths)
- (Hypocaust, was, Roman heating system)
- (Arch, was characteristic of, Roman architecture)

## Economy
- (Denarius, was, silver Roman coin)
- (Aureus, was, gold Roman coin)
- (Sestertius, was, brass Roman coin)
- (Trade, flourished along, Mediterranean)
- (Silk Road, connected Rome to, China)
- (Egypt, supplied grain to, Rome)
- (Latifundia, were, large Roman estates)

## Christianity
- (Jesus, was crucified under, Pontius Pilate)
- (Early Christians, were persecuted by, Romans)
- (Edict of Milan, legalized Christianity in, 313 AD)
- (Council of Nicaea, occurred in, 325 AD)
- (Edict of Thessalonica, made Christianity state religion in, 380 AD)
- (Pope, became based in, Rome)

## Decline & Fall
- (Empire, was divided in, 285 AD)
- (Western Roman Empire, fell in, 476 AD)
- (Romulus Augustulus, was, last Western emperor)
- (Odoacer, deposed, Romulus Augustulus)
- (Visigoths, sacked Rome in, 410 AD)
- (Alaric, led, Visigoth sack of Rome)
- (Vandals, sacked Rome in, 455 AD)
- (Attila, led, Huns)
- (Eastern Roman Empire, became known as, Byzantine Empire)
- (Byzantine Empire, fell in, 1453 AD)
- (Constantinople, fell to, Ottoman Turks)
- (Edward Gibbon, wrote, Decline and Fall of the Roman Empire)

## Pax Romana
- (Pax Romana, lasted approximately, 200 years)
- (Pax Romana, began with, Augustus)
- (Pax Romana, ended with, Marcus Aurelius's death)
- (Five Good Emperors, included, Nerva, Trajan, Hadrian, Antoninus Pius, Marcus Aurelius)

## Legacy
- (Roman Empire, influenced, Western civilization)
- (Latin, evolved into, Romance languages)
- (Romance languages, include, Italian, French, Spanish, Portuguese, Romanian)
- (Holy Roman Empire, claimed succession from, Roman Empire)
- (Julian calendar, was introduced by, Julius Caesar)
- (Gregorian calendar, replaced, Julian calendar)
- (Months July and August, are named after, Julius Caesar and Augustus)
- (SPQR, stood for, Senatus Populusque Romanus)

Let me know if you'd like me to expand any particular area in more detail!
