---
id:"kb-2026-00352"
title:"Roman Empire"
schema_type:"TechArticle"
category:"history"
language:"en"
confidence:"high"
last_verified:"2026-05-22"
generation_method:"ai_assisted"
ai_models:["claude-opus"]
derived_from_human_seed:true
primary_sources:
  - title:"The History of the Decline and Fall of the Roman Empire (Edward Gibbon)"
    type:"book"
    year:1776
    url:"https://www.gutenberg.org/ebooks/731"
    institution:"Project Gutenberg"
secondary_sources:
  - title: "MDN Web Docs — HTTP"
    type: "documentation"
    year: 2026
    url: "https://developer.mozilla.org/en-US/docs/Web/HTTP"
    institution: "Mozilla"
completeness: 0.88
ai_citations:
  last_citation_check:"2026-05-22"
---

## TL;DR

The Roman Empire was the post-Republican period of ancient Rome (27 BCE - 476 CE West, -1453 CE East). At its peak (117 CE, Trajan), it spanned 5 million km² across Europe, North Africa, and the Middle East. The Roman Empire's legal, linguistic, architectural, and political legacy shaped Western civilization.

## Core Explanation

Five Good Emperors (96-180 CE): Nerva, Trajan, Hadrian, Antoninus Pius, Marcus Aurelius. Crisis of the Third Century (235-284 CE): 26 emperors in 50 years. Constantine (306-337): legalized Christianity (Edict of Milan, 313), founded Constantinople. Division (395): Western (Rome) and Eastern (Constantinople) Empires. Fall: multiple causes — political instability, economic decline, barbarian invasions (Visigoths sack Rome, 410 CE), last emperor deposed (476).

## Further Reading

- [The History of the Decline and Fall of the Roman Empire (Edward Gibbon)](https://www.gutenberg.org/ebooks/731)