342 CE The original Hagia Sophia is dedicated in Constantinople. Paul I, Patriarch of Constantinople, is deposed and replaced by Macedonius I. Jin Kangdi succeeds his brother Jin Chengdi as emperor of China.
In the 340s , the 4th century .
Constans I campaigns victoriously against the Franks.source Goguryeo is invaded by Murong Huang of the Xianbei.source Jin Kangdi succeeds his brother Jin Chengdi as emperor of China.source Emperor Constans I campaigns in Britain against the Picts.source February 15 – The original Hagia Sophia is dedicated in Constantinople.source Paul I, Patriarch of Constantinople, is deposed and replaced by Macedonius I.source A large earthquake strikes Cyprus.source Births Fei of Jin (or Sima Yi), Chinese emperor (died 386)source Deaths July 26 – Chen of Jin (or Sima Yan), Chinese emperor (born 321)source Paul of Thebes, Christian hermit (approximate date)source Barsabias, Christian abbot, missionary and martyrsource Tiberius Julius Rhescuporis VI, Roman client kingsource Nearby 340–349 Days named on this page 12 of 12 sourced entries shown. Every line above is quoted from the revision linked beside it, which is 342 on English Wikipedia, revision 1314901667, retrieved 2026-09-06. Nothing on this page is written by us and nothing is generated: the sentences are the source’s own, so a claim you doubt can be checked against the exact revision it came from. Text is reused under CC BY-SA 4.0 .