300 – Wikipedia

Events
– Emperor Diocletian begins construction of a palace that will become the city of Split
– Caesar Constantius I wins a victory over the Franks
– The lion becomes extinct from Armenia
– The Yayoi period ends in Ancient Japan
– Wootz steel is developed in India

Roman Empire
– Emperor Diocletian begins construction of a palace that will become the city of Split
– Caesar Constantius I wins a victory over the Franks

Asia
– The lion becomes extinct from Armenia
– The Yayoi period ends in Ancient Japan
– Wootz steel is developed in India
– The Kama Sutra, an Indian handbook on the art of sexual love, is probably produced around this time by the sage Vatsyayana
– Micheon becomes ruler of the Korean kingdom of Goguryeo

Africa
– The elephant becomes extinct in North Africa
– The Atlas wild ass becomes extinct

Mesoamerica
– The Formative/Preclassic period in Mesoamerica comes to an end
– 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

Art and Science
– The magnetic compass for navigation is invented in China
– The Panchatantra, a Sanskrit collection of fables and fairy tales, is written in India
– The Tetrarchs are probably made in Egypt. After 330, they are moved to Constantinople and in 1204, they are installed at the corner of the facade of the St Marks Basilica, Venice
– Diocletian’s Palace, Split, Croatia, is built. Its model is nowadays kept at the Museo della Civilta Romana, Rome

Religion
– Peter of Alexandria becomes Patriarch of Alexandria
– Possible date of the Codex Vaticanus Graecus 1209 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 prohibits interaction with Jews, pagans, and heretics

Births
– Aemilia Hilaria, Gallo-Roman physician
– Flavius Hermogenes, Roman prefect and politician
– Frumentius, Syrian missionary and bishop
– Hilary of Poitiers, Gallo-Roman bishop
– Li Shou, Chinese emperor of the Cheng Han Dynasty

Deaths
– Jia Mi, Chinese general, official, and politician
– Jia Nanfeng, Chinese empress of the Jin Dynasty
– Liu Ling, Chinese scholar and poet
– Lüzhu, Chinese dancer, singer, and music teacher
– Pan Yue, Chinese poet and writerSources: https://en.wikipedia.org/wiki/300_AD