What's the longest war in history?

The longest war in history is believed to be the Reconquista (Spanish for Reconquest), with a duration of 781 years.

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The Reconquista was a period in the history of the Iberian Peninsula between the Umayyad conquest of Hispania in 711, the expansion of the Christian kingdoms throughout Hispania, and the fall of the Nasrid kingdom of Granada in 1492.

For further reading check the following articles:

• Portuguese India
• British Raj
• Dutch Colonialism in India