Template:Encyclopedia Westarctica:This month in history/September
- 12 September - Travis McHenry uses the Consular Crown to crown himself Consul-General of the Achaean Territory in a coronation ceremony conducted at Marmaris Castle in Southern Turkey. (2001)
- 24 September - Hostilities caused by the Siple War are ended when Grand Duke Niels of Flandrensis and Grand Duke Travis sign the West-Antarctic Treaty. (2010)
- 25 September - The Consular-Consort is appointed. (2003)