What Is 170 CE

Overview

The year 170 CE falls within a pivotal period of ancient history, characterized by military conflict, philosophical development, and widespread disease. It occurred during the reign of Roman Emperor Marcus Aurelius, who ruled from 161 to 180 CE and was known for his commitment to Stoic philosophy.

This era saw the Roman Empire grappling with external invasions and internal instability. Meanwhile, intellectual and scientific advancements continued despite the challenges of war and plague. The following section highlights key events and developments during this year.

• Emperor Marcus Aurelius was commanding Roman legions along the Danube River in 170 CE, personally leading campaigns against the Marcomanni and Quadi tribes during the Marcomannic Wars.
• The Antonine Plague, likely smallpox, continued to ravage Roman cities in 170 CE, with mortality rates estimated at up to 2,000 deaths per day in Rome at its peak.
• Galen of Pergamon, one of antiquity’s most influential physicians, was active in Rome in 170 CE, conducting public dissections and refining theories of human anatomy and disease.
• In China, the Eastern Han Dynasty was experiencing political fragmentation by 170 CE, with regional warlords gaining power and the central government losing control amid peasant uprisings.
• The Silk Road remained a vital trade network in 170 CE, facilitating the exchange of goods such as silk, spices, and ideas between Rome, Persia, India, and China.

How It Works

Understanding the significance of 170 CE requires examining the political, medical, and cultural dynamics of the time. This year was not defined by a single event but by a convergence of long-term trends across multiple empires.

• Marcomannic Wars: Beginning in 166 CE and lasting until 180 CE, these conflicts saw Germanic and Sarmatian tribes breach the Roman frontier, forcing Marcus Aurelius to campaign in modern-day Austria and Hungary during 170 CE.
• Stoic Philosophy: Marcus Aurelius wrote sections of his Meditations during military campaigns, including around 170 CE, promoting self-discipline, rationality, and acceptance of fate as core Stoic principles.
• Antonine Plague: Introduced by soldiers returning from campaigns in Mesopotamia, the plague recurred in waves through 170 CE, reducing the Roman population by an estimated 10% to 20% over its duration.
• Galen’s Medical Research: In 170 CE, Galen advanced the theory of the four humors and emphasized observation and experimentation, laying foundations for Western medicine for over a millennium.
• Trade and Diplomacy: Roman merchants maintained contact with the Parthian Empire and Han China in 170 CE, with Roman coins and glassware found as far east as modern-day Vietnam.
• Religious Developments: Christianity continued to spread across the Roman Empire in 170 CE despite periodic persecution, with early theologians like Justin Martyr defending the faith in written apologetics.

Key Comparison

This comparative view highlights how 170 CE was a time of transition across civilizations. While Rome and China faced internal decay and external threats, other regions experienced cultural growth or political decentralization. These dynamics shaped the trajectory of world history in the centuries that followed.

Key Facts

Several specific events and figures from 170 CE have left a lasting historical footprint. These facts illustrate the interconnected nature of ancient societies and the enduring impact of this era.

• 170 CE marks a documented phase in the Marcomannic Wars, with Roman forces pushing into modern-day Slovakia to repel invading tribes.
• Galen published On the Usefulness of the Parts of the Body around this time, a foundational medical text based on animal dissection and observation.
• The population of Rome in 170 CE was approximately 1 million people, though the plague reduced urban populations significantly over the decade.
• In 170 CE, the Han Dynasty’s capital, Luoyang, housed over 500,000 residents and was one of the largest cities in the world.
• The Roman army maintained around 30 legions in 170 CE, totaling roughly 150,000 soldiers deployed across the empire’s borders.
• Astronomical records from China in 170 CE noted a comet, later interpreted as an omen of dynastic decline.

Why It Matters

The year 170 CE is significant not for a single event but for the convergence of military, medical, and philosophical developments that shaped later civilizations. It represents a turning point where empires began facing systemic challenges that would eventually lead to transformation or decline.

• The Marcomannic Wars marked a shift in Roman military policy, as the empire began relying more on barbarian recruits by the late 2nd century.
• Galen’s work in 170 CE influenced medical practice in Europe and the Islamic world for over 1,300 years, until the Renaissance.
• The Antonine Plague weakened Roman military and economic strength, contributing to the Crisis of the Third Century.
• Stoicism, as practiced by Marcus Aurelius in 170 CE, has seen a modern revival in psychology and self-help disciplines.
• Trade connections active in 170 CE laid the groundwork for later global exchange networks, including the medieval Silk Road.

Studying 170 CE offers insight into how societies respond to crisis, innovation, and change. Its legacy endures in philosophy, medicine, and the study of imperial decline.