300

Millennium:	1st millennium
Centuries:	2nd century – 3rd century – 4th century
Decades:	270s 280s 290s – 300s – 310s 320s 330s
Years:	297 298 299 – 300 – 301 302 303

The world in 300.

300 by topic
Politics
State leaders – Sovereign states
Birth and death categories
Births – Deaths
Establishment and disestablishment categories
Establishments – Disestablishments

Year 300 (CCC) was a leap year starting on Monday (link will display the full calendar) of the Julian calendar.

Events

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 what is now Lullingstone, and also in Anderitum (approximate date).

The Formative/Preclassic period in Mesoamerica comes to an end (around this year).
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.

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.
The Tetrarchs are probably made in Egypt. After 330 the are moved to Constantinople and in 1204 they are installed at the corner of the facade of the St Mark's Basilica, Venice (approximate date).
Diocletian's Palace, Split, Croatia, is built. Its model is nowadays kept at the Museo della Civilta Romana, Rome.

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 was a church council that prohibited interaction with Jews, pagans, and heretics.