251 deaths

Gaius Messius Quintus Trajanus Decius ( 201June 251), known as Trajan Decius or simply Decius (), was Roman emperor from 249 to 251.

Christian saint and martyress (235–261)

Hostilian (; died July 251) was briefly Roman emperor in 251. Hostilian was born to Decius and Herennia Etruscilla at an unknown date and elevated to caesar in 250 by Decius. After Decius and Herennius Etruscus, Hostilian's brother, were killed at the Battle of Abritus, an ambush by the Goths, Trebonianus Gallus was proclaimed emperor by the legions. Almost immediately, he elevated Hostilian to co-emperor and his own son, Volusianus, to caesar. Hostilian died soon after, either due to plague or being murdered by Trebonianus Gallus.

Roman emperor (220-251)

Chinese general, politician and regent (179-251)

Christian bishop and saint

Egyptian saint

Shu Han official, diplomat and general (died 251)

bishop of Comana in Pontus(died c. 251)

Christian martyr and saint

Empress of Cao Wei (died 251)

Chinese Cao Wei state general (died 251)

prince of the Cao Wei state (195-251)

imperial prince of Cao Wei (died 251)

Official of the state of Shu Han (died 251)

married couple

Saint and bishop