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Roman Empire

• The Franks penetrate into what is now northern Belgium (approximate date).
• The city of Split is built.
• Diocletian's wall is built in Palmyra.
• A Romano-Celtic temple-mausoleum complex is constructed in Lullingstone, and also in Anderitum (approximate date).

Europe

• The lion becomes extinct from Armenia around this date.

Africa

• The elephant becomes extinct in North Africa from around this date.
• The Algerian Wild Ass becomes extinct around this date.

America

• The Mayan civilization reaches its most prolific period, the classic period, in what is now Guatemala, Belize and parts of southern Mexico adjacent to the former two. During most of this period, Tikal dominates the mayan world.

Arts and sciences

• The magnetic compass for navigation is invented in China (approximate date).
• The Panchatantra, a Sanskrit collection of fables and fairy tales, is written in India.

Religion

• Peter of Alexandria becomes Patriarch of Alexandria.
• Possible date of the Codex Vaticanus and Codex Sinaiticus, manuscripts of the Bible written in Greek.
• Tiridates III makes his kingdom of Armenia the first state to adopt Christianity as its official religion.
• Approximate date of the Synod of Elvira in Elvira, Spain, which was a church council that prohibited interaction with Jews, pagans, and heretics.

Births

• Asanga, founder of the Yogacara of Mahayana Buddhism (approximate date)
• Frumentius, Syrian Christian trader (approximate date)
• Hilary of Poitiers (approximate date)
• Li Shou, emperor of Cheng Han (d. 343)
• Emperor Min of Jin (d. 318)

Deaths

• December 28 — Theonas, Patriarch of Alexandria
• Sporus of Nicaea, Greek mathematician and astronomer (approximate date)
• Zhang Hua, official of the Jin Dynasty (b. 232)
• Liu Ling (b. 221)
• Empress Jia Nanfeng (b. 257)
• Sima Yu (b. 278)