Seleucid Empire, 150–63 BCE

Autocracy · Empire · Middle East · Age of Rome era

The rump Seleucid empire in its terminal decline, a shrinking Hellenistic monarchy consumed by dynastic war before Roman annexation of Syria.

By the mid-second century the Seleucid empire had shrunk to a Syrian core consumed by near-continuous dynastic civil wars among rival claimants, its provinces lost to Parthia, local dynasts and Rome. Central authority collapsed as pretenders bought armies and cities changed hands. Pompey ended the moribund monarchy by organizing Syria as a Roman province in 63 BCE.

Open Seleucid Empire 150–63 BCE in the interactive 3D atlas →

Dominant patterns

  • Imperial Decline
  • Institutional Decay
  • Succession Crisis
  • Revolutionary Risk
  • External Expansion

Political-science factor profile

Each factor 0–100; higher = stronger authoritarian / crisis pole (except institutional stability, where higher = stronger institutions).

Centralization of Power35
Media Control45
Repression48
Nationalism45
Militarization62
Economic Stress60
External Conflict72
Cult of Personality60
Elite Fragmentation88
Institutions30
Social Polarization55
Corruption & Patrimonialism62
Ideological Mobilization50
External Sovereignty60

Economy & society

GDP per capita$700 (intl-$)
Population6.0M people
Share of world population3%
Territory~300k km²
Capital population~300k

Closest historical twins

The country-eras whose structural profile most resembles Seleucid Empire 150–63 BCE, by similarity score (0–100).

  1. Eastern Jin, 317–420 CE – similarity 87/100 · shared: Imperial Decline, Institutional Decay, Succession Crisis, Revolutionary Risk, External Expansion
  2. Visigothic Kingdom, 600–711 CE – similarity 87/100 · shared: Imperial Decline, Institutional Decay, Succession Crisis, Revolutionary Risk, External Expansion
  3. Mexico, 1821–1848 – similarity 87/100 · shared: Imperial Decline, Institutional Decay, Revolutionary Risk, External Expansion
  4. Safavid Persia, 1666–1722 CE – similarity 83/100 · shared: Imperial Decline, Institutional Decay, Succession Crisis, Revolutionary Risk
  5. Spain, 1788–1814 – similarity 83/100 · shared: Imperial Decline, Institutional Decay, Succession Crisis, External Expansion
  6. Ottoman Empire, 1789–1808 – similarity 82/100 · shared: Imperial Decline, Institutional Decay, Succession Crisis, External Expansion
  7. China, 1911–1916 – similarity 81/100 · shared: Imperial Decline, Institutional Decay, Revolutionary Risk
  8. Western Zhou, 850–771 BCE – similarity 79/100 · shared: Imperial Decline, Institutional Decay, Succession Crisis, Revolutionary Risk, External Expansion

What followed

  • Dissolution amid endless dynastic civil war.
  • Pompey’s annexation of Syria in 63 BCE.