British colonists were sailing along the Pacific Ocean and within the distance they spotted a family of islands.
Deciding to ignore the order given to them by their captain, they mutinied and changed their route, heading for the islands.
Upon reaching the shore, they soon realized that the lands were uninhabited and free for the taking.
The group of colonists would then become rogue and seize the islands for themselves, naming them the "Republic of Grennia" and never
returning to Great Britain to report back to the King about their findings. As for the captain, he was never seen after the mutiny.

This moment of prosperity would come to an end in 1868, during the Meiji Restoration. Imperial rule was restored into Japan and as a result, the country was looking to expand it’s empire. Due to Grennia’s close proximity to Japan, Emperor Meiji had intention to annex Grennia to the Japanese empire. Great Britain and the USA would soon join in on the pursuit of acquiring the islands of Grennia, causing the trio to debate of who shall reign over its islands. An agreement was made through the Anglo-Japanese Alliance in 1902, with the trio coming to a unanimous decision of delegating cities amongst themselves. Japan was to hold control of Gekkouga City, the British holding control of Gekogashira City, and the US was to hold control of Keromatsu and Satogeko City. The alliance would remain strong and in effect throughout all of WWI, with the citizens of the imperialised Grennia offering its support to the three nations until relations between Japan and the Western world soured.

With the Great Depression in the 1930s and the rise of fascism in Japan, Britain and the USA had to quickly decide what to do with Grennia in case of another war. Britain quickly came up with a solution to take all the islands from Japan and the USA to fortify them. The USA allowed the annexation, but Japan did not and in July of 1940 Grennia was forcibly annexed by Japan after the British were forced to surrender. Throughout the rest of WWII, Japan held onto the islands and committed many atrocities on the local population.

With WWII over, Japan agreed to surrender Grennia wholly to Great Britain once again, this time under peaceful terms. Throughout the 1950s and into the 1980s, Grennia's economy boomed under lots of Japanese and American economic investment. In the late 1960s, local Grennians vowed for independence and efforts were made, however they quickly fell apart due to a lack of organised resistance and a referendum showing a narrow 53.4% No vote..

Around the same time, the post-war boom dramatically slowed down and the economy grew more stagnant, along with renewed calls for independence from Britain's empire now down to very few remaining colonies. On February 28, 1995, Britain finally signed an agreement with various local pro-independence groups and agreed to give Grennia full independence in ten-years' time, in 2005.

Upon the signing of the Grennian-British Transitional Agreement in 1995, the Grennian Republic would begin to take steps to function as an independent country for the next century and millennium. The concept of developing a Constitution was favoured amongst most citizens and within days of the signing of the agreement, work on the first draft had begun. Along with the creation of the Grennian Constitution, citizens would see a rise of new political parties ranging from the Green Party to the Social Labour Party. These parties would adopt the traits of those in other countries, advocating for their ideology when put into office.

As the day of independence grew nearer, the Grennian people were quick to realize they needed more time for the grandiose execution of gaining independence and functioning with minimal to no error. On February 24 2005, Grennia requested they be given an extension to complete their preparations to which Great Britain agreed. On May 6th 2005, the Republic of Grennia declared and gained their independence from Great Britain, along with the signing of their own Constitution in an extravagant ceremony on Capitol Hill in Gekkouga City.