300

Roman Empire

 * The penetrate into northern  (approximate date).
 * The city of is built.
 * Diocletian's wall is built in.
 * A Romano-Celtic temple-mausoleum complex is constructed in, and also in (approximate date).

Europe

 * The becomes extinct from  around this date.

Africa

 * The becomes extinct from  around this date.
 * The becomes extinct around this date.

America

 * is established in what is now and.

Arts and sciences

 * The magnetic for  is invented in  (approximate date).
 * The, a collection of fables and fairy tales, is written in.

Religion

 * becomes.
 * Possible date of the and, manuscripts of the Bible written in.
 * makes his kingdom of the first state to adopt  as its official religion.
 * Approximate date of the in, , which was a church council that prohibited interaction with , , and.

Births

 * , founder of the of   (approximate date)
 * ,  trader (approximate date)
 * (approximate date)
 * , emperor of

Deaths

 * , Greek mathematician and astronomer (approximate date)
 * , official of the
 * , official of the