The Contenders: Defining the Longest War To identify the longest war, one must first move beyond counting days and examine the nature of the conflict. Yet the title of the longest war in recorded history belongs to a conflict defined less by constant battle and more by a state of unresolved hostility spanning generations.
Which War Lasted Centuries Not Years: The Roman-Persian Struggle
Closer to the modern era, the intermittent conflict between the Kingdom of Bhutan and the Tibetan Empire, sometimes referred to as the Tibetan-Bhutanese war, is noted for lasting roughly 300 years, from the 17th to the 19th century. This is the story of the Roman-Persian Wars, a titanic struggle that stretched across the ancient world for over seven centuries, shaping the fate of empires and the course of civilization itself.
This was not a single war with a clear beginning and end, but rather a cyclical series of engagements, treaties, and proxy wars centered on the contested regions of Armenia and Mesopotamia. The conflict effectively began with the Parthian Wars of Emperor Trajan around 115 AD and did not conclude until the Muslim Arab conquests overwhelmed the Sassanian Empire in the 630s, a timespan of approximately 717 years.
Which War Lasted Centuries Not Years: The Roman-Persian Struggle
Conflict Approximate Duration Primary Combatants Roman-Persian Wars ~698 years (115 AD – 630 AD) Roman/Byzantine Empire vs. Parthian & Sassanian Empires Byzantine-Arab Wars ~400 years (7th – 11th century) Byzantine Empire vs.
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