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253

Centuries: 2nd century - 3rd century - 4th century

Decades: 200s 210s 220s 230s 240s - 250s - 260s 270s 280s 290s 300s

Years: 248 249 250 251 252 - 253 - 254 255 256 257 258

Events

Pope Lucius I succeeds Pope Cornelius
Aemilianus becomes Roman emperor
Valerian I becomes Roman emperor. He appoints his son Gallienus as his junior colleague.

Births

Deaths

Pope Cornelius

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... H+. The electrons transfer from the primary acceptor to plastoquinone, then to plastocyanin, producing proton-motive force as with cyclic electron flow and driving ATP ...