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• 3rd-century disestablishments in the Roman Empire (6 C, 5 P)
• 3rd-century establishments in the Roman Empire (9 C, 17 P)

0–9

• 200s in the Roman Empire (1 C, 1 P)
• 210s in the Roman Empire (1 C, 7 P)
• 220s in the Roman Empire (2 P)
• 230s in the Roman Empire (2 C, 6 P)
• 240s in the Roman Empire (6 P)
• 250s in the Roman Empire (13 P)
• 260s in the Roman Empire (2 C, 7 P)
• 270s in the Roman Empire (2 C, 7 P)
• 280s in the Roman Empire (1 C, 3 P)
• 290s in the Roman Empire (2 C, 10 P)

A

• 3rd century in Roman Africa (1 C, 1 P)

B

• 3rd-century bishops in the Roman Empire (8 C, 2 P)
• 3rd century in Roman Britain (2 C, 3 P)

C

• Christians martyred during the reign of Diocletian (2 C, 96 P)
• Constantinian dynasty (5 C, 54 P)
• Crisis of the Third Century (12 C, 80 P)

E

• 3rd century in Egypt (5 C, 5 P)

F

• Fiction set in 3rd-century Roman Empire (3 P)

G

• 3rd century in Roman Gaul (5 C, 5 P)

H

• 3rd century in Hispania (1 C, 1 P)

I

• 3rd century in Italy (2 C, 5 P)

P

• 3rd-century Romans (11 C, 290 P)

R

• Roman–Parthian Wars (3 C, 24 P)

S

• 3rd-century Roman sculptures (16 P)
• Severan dynasty (4 C, 32 P)

T

• Tetrarchy (3 C, 32 P)

• Western Roman Empire

A

• Alexamenos graffito

B

• 3rd century in Roman Britain

C

• Coinage from Maximinus Thrax to Aemilianus
• Crisis of the Third Century

D

• Defence-in-depth (Roman military)
• Dominate

F

• Frankfurt silver inscription

L

• Little Peace of the Church

Q

• Quinquegentiani

R

• Roman–Palmyrene War of 272–273
• Roman–Parthian Wars

S

• Severan dynasty
• Syria Palaestina

T

• Tetrarchy