Re: Event of the Year
 

261

Michu ascends the Silla throne, becoming the first king of the long Kim line.

Re: Event of the Year
 

260

Syria, Egypt and Palestine break off from the Roman Empire to form the Persian-supported Palmyran Empire

Re: Event of the Year
 

259

Postumus revolts against Gallienus, in Gaul. The western provinces of Britain and Spain join his independent realm—which is called in modern times the Gallic Empire.

Re: Event of the Year
 

258

Gaul, Britain and Spain break off from the Roman Empire to form the Gallic Empire. Also a second Imperial edict prohibits Christianity in the Roman Empire. This edict divides Christians into four categories: priests, who are to be put to death; senators and equestrians, who are to be stripped of their positions and their property confiscated; nuns, who are to be exiled, and imperial civil servants, who are condemned to forced labour.

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257

Valerian's persecution of Christians begins: his edict orders bishops and priests to sacrifice according to the pagan rituals, and prohibits Christians, under penalty of death, from meeting at the tombs of their deceased.

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256

Goths invade Asia Minor. Dacia is lost for the Roman Empire.

Re: Event of the Year
 

255

Wuqiu Jian, general of the Kingdom of Wei, dies.

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254

May 12 — Pope Stephen I succeeds Pope Lucius I as the 23rd pope.

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253

Period of the Thirty Tyrants in the Roman empire. For the most part, Generals in the border regions are proclaimed Emperor by their armies in order to stop the (primarily) Germanic invaders.

Re: Event of the Year
 

252

Sun Liang succeeds Sun Quan as king of the Chinese Kingdom of Wu.