Postal Relay Systems
Organized courier routes, relay stations, and official messengers for state communication across long distances.
Core metadata
- ID: postal_relay_systems
- Era: Classical
- First known date: -550 (century)
- Region: Achaemenid Persian Empire
- Review status: source_checked
- Maturity: N/A
Prerequisites
Dependents
- Military Road Waystations (military_road_waystations)
- Military Waystations (military_waystations)
- Newspaper Periodicals (newspaper_periodicals)
- Postal Money Orders (postal_money_orders)
Fields
- None.
Node sources
- Postal system: History (Encyclopaedia Britannica, 2026, textbook) • Supports: node
Locator: The history section says the Persian Empire of Cyrus in the 6th century BCE employed relays of mounted messengers served by posthouses.
Prerequisite edge evidence
Edge/source evidence summary:
- Prerequisite edges: 4
- Average edge confidence: 72%
- Prerequisite sources: 4
- expert_inference: 4
| Prerequisite | Type | Confidence | Evidence level | Note | Sources |
|---|---|---|---|---|---|
| Roads (roads) | enabling | 68% | expert_inference | Roads provides a capability that enables this technology without being the only possible path. |
|
| Writing (writing) | historical_predecessor | 75% | expert_inference | Writing is an earlier historical predecessor or foundation, not a one-to-one engineering dependency. |
|
| Record Keeping (record_keeping) | historical_predecessor | 75% | expert_inference | Record Keeping is an earlier historical predecessor or foundation, not a one-to-one engineering dependency. |
|
| Horseback Riding (horseback_riding) | enabling | 68% | expert_inference | Horseback Riding provides a capability that enables this technology without being the only possible path. |
|
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