Who Died in 304 AD Jan 21 Saint Agnes (martyred) (b. 291) Mar 26 Saint Emmanuel, Christian martyr killed under Diocletian Oct 25 Marcellinus, Bishop of Rome, Catholic Pope (296-304), and Catholic & Serbian Orthodox saint dies (age unknown) 303 AD History by Year 305 AD Famous Romans Augustus Caesar Caligula Constantine the Great Julius Caesar Mark Antony Nero