|annexation date||26 January 2010|
|land area||52.9 sq feet|
As part of the property declared independent from the United Kingdom in September 2008, Commius Flats had technically been part of the Empire since its founding, although Austenasian authority was only asserted over the land on 28 August 2009 when a military force occupied the land and an Act of Parliament annexed it to the Empire.
On 27 January 2010, half of Commius Flats was ceded to the Slinky Empyre to become its fifth Department, and HIH Empress Margaret was appointed Vicereine. This region was named Tincomarus (Slin-Englysh: Tyncomarus) Department, in honour of Commius' son. By early 2011, the Slinky Empyre had fallen, leaving Tincomarus Department effectively terra nullius.
The formation of the Slinky Republyc raised the question of whether or not Tincomarus Department was under their nominal jurisdiction, but the self-declared successor state never expressly claimed the land, nor was it ever officially recognised by Austenasia as the Empyre's successor. Eight days after the Republyc itself dissolved, on 6 March 2011, Austenasia occupied Tincomarus Department, and re-annexed the land to the Empire the day afterwards.