Everything has a timeline

TiMELiNES

c. 500 BCE

Imperial spy systems documented

Ancient empires including Persia and China employ organized intelligence and observation networks.

Canonical milestoneAncient Eurasia1 timeline

Context

Appears In

TimelineTimeline of Surveillance

Position 1

Authority

Sources

Encyclopaedia BritannicaConfidence 90%

Taxonomy

Tags

intelligencesurveillance