Directory

301 CE

The republic of San Marino is established (approximate date). Diocletian issues his Edict on Maximum Prices, which, rather than halting rampant inflation, causes widespread panic and an increase in inflation. The measure is quickly abandoned. King Tiridates III (the Great) proclaims Christianity as the official state religion, making Armenia the first nation to adopt Christianity as its official religion (traditional date). Construction of the original Etchmiadzin Cathedral by Gregory the Illuminator begins.

Geopolitics & Diplomacy

  • September 3 – The republic of San Marino is established (approximate date).source

Conflict & Security

  • February 3 – May 30 – Sima Lun briefly usurps the Jin Dynasty.source
  • Caesar Galerius begins a major war against the Carpi and Bastarnae and wins the first of several victories.source

Religion & Belief

  • King Tiridates III (the Great) proclaims Christianity as the official state religion, making Armenia the first nation to adopt Christianity as its official religion (traditional date). Construction of the original Etchmiadzin Cathedral by Gregory the Illuminator begins.source

Economy & Finance

  • September: Emperor Diocletian issues a reform that revalues the Roman currency.source
  • November: Diocletian issues his Edict on Maximum Prices, which, rather than halting rampant inflation, causes widespread panic and an increase in inflation. The measure is quickly abandoned.source

Births

  • Xie Ai, Chinese general of the Former Liang state (d. 354)source

Deaths

  • June 5 – Sima Lun, Chinese usurper (forced suicide)source
  • Sun Xiu (or Junzhong), Chinese official and politiciansource