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The speculatores, also known as the speculatores augusti or the exploratores, were an ancient Roman reconnaissance agency. They were part of the consularis and were used by the Roman military. The speculatores were headquartered in the Castra Peregrina.

This organization probably originated from previous Greek military spies and scouts. There are references to a Roman scouting agency operating during the Samnite Wars and the speculatores being employed during the Roman war with the Aequi. Emperor Augustus reformed the Roman communications system. Among other reforms, he also added 10 speculatores to each legion. There was one speculator per cohort. They also served in the Praetorian Guard. They also served as political police, until they were replaced by the frumentarii as police in the third century. As bodyguards, they were tasked with clearing the emperor's pathway of crowds. To do this, they used a type of non-lethal spear known as a lancea. They also served as scouts, executioners, torturers, and assassins. During their operations, they worked in small numbers. Usually in pairs or as individuals. The speculatores were trained by an official known as a centurio exercitator to become skilled in fighting, horseriding, parading, and escorting. Three other officials had important roles in the speculatores. These were the centurio and the centurio speculatorum, centurio trecenarius, and the centurio speculatorum equitarum. There were around 300 members of the speculatores. They were chosen based on their discretion and loyalty. Many speculatores would go on to become couriers. Their duties lead to them becoming feared and despised by the populace.

References

1. Rankov 2015, p. 1.
2. Fuhrmann 2011, p. 119.
3. Hurley 2014, p. 193.
4. Golding 1951, p. 478-485.
5. Nelis-Clément 2015, p. 3.
6. Sheldon 2015, p. 13.
7. Rankov 1990, p. 167.
8. Sheldon 2004, p. 18.
9. ^ Sheldon 2004, p. 165.
10. Triplat 2019, p. 458.
11. Rankov 2016, p. 24.
12. Kyrychenko 2014.
13. Ng 2012, p. 2.
14. Cowan 2014, p. 33.
15. Sheldon 2004, p. 167.
16. Speidel 2002.
17. Wolff 2015, p. 2.
18. ^ Bunson 2014, p. 512.
19. Speidel 2002, p. 34, 56.
20. Coulston 2018, p. 177.
21. Cowan 2014, p. 32-33.
22. Bunson 2014, p. 315-316.
23. Busch 2007, p. 315-316.
24. Sheldon 2004, p. 122.
25. Sheldon 2004, p. 144.
26. Cairo 2015, p. 1.

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• Infantry units and formations of ancient Rome
• Army reconnaissance units and formations