Anna

The Spring Sovereign of Arendelle
"'My sister is gone; free and unyielding. It is now up to me to honor her legacy as Queen by writing my own legacy. Here I am, I am now Queen of Arendelle. And I will do the next right thing.' - Anna, upon assumption of the Throne from her sister."

Beginnings
Born in the Spring Equinox of 1821, Anna is the younger sister of Elsa, and her exact opposite. Anna grew up to be a happy, energetic, unyielding, kind individual. She always longed for her sister's attention, especially when the two were separated in their youth. Anna likes simple and sweet things, like chocolates. She is also very friendly, being acquainted with almost everyone in Arendelle in various ways. She is an adventurous lass, sometimes impulsive, but she makes sure that even the dire situations turn into her favor. Anna is willing to risk everything, especially for her sister.

As Queen of Arendelle (1842 - 1843)
After undoing her grandfather's dubious deeds, Anna finds herself Queen of Arendelle after Elsa voluntarily relinquishes the position to her to take up the role of protecting the Enchanted Forest. Under Anna's reign, Arendelle has seen great days; commerce and general living conditions reached its peak as she continues her father's, and her sister's policy of neutrality, and attention towards the people's needs. It didn't take long for Anna to be greatly loved by the citizens of Arendelle.

The War with the Southern Isles - Weselton (Frozen AU / 1842 - 1843)
Shortly after Elsa left, Prince Hans and his brothers, with the support of their father, King Heinrich; the Southern Isles and Weselton, with the Duke's support invaded the kingdom. Without Elsa, Anna is left to deal with the war that saw Arendelle being taken over by her enemies, tarnishing her reign as queen. She had to be exile from Arendelle, and fought for months on the mountains.

Eventually, Elsa returns from the Enchanted Forest, and the sisters unite to fight back Weselton and the Southern Isles. The neighboring kingdoms of Denmark, and Norway-Sweden aided the two in the fight, forming a coalition against the aggressors; a feat that haven't been seen since the days of the Kalmar Union. Anna led the liberation of Arendelle, and defeats Hans, capturing him during the final battle.

The Diarchy Compromise of 1843, Northuldra, and Constitutional Monarchy (1843-1844)
After the war, Anna's sister felt that she doesn't really belong in the Enchanted Forest, and instead, back in Arendelle to be a leader. Anna haven't been Queen of Arendelle for a year, so the Royal Council, under Anna's leadership declared the Kingdom of Arendelle to be a diarchy (the rule of two); the first to do so since the ancient Spartans. The diarchy proved effective as Elsa and Anna combined their leadership to better Arendelle and her people. Elsa oversees the authoritarian aspect of the kingdom, while Anna serves as the executive aspect. Amid the diarchy, Elsa felt that being queen again was too much. In response, Anna abolishes the diarchy, and pits the kingdom as a constitutional monarchy, with Elsa as the State Autocratess (equivalent to a Prime Minister) of Arendelle.

A situation involving the Northuldra Tribe put the diarchy in a complicated position as Yelena and her followers are demanding Elsa to fulfill her duties as Protector. Anna felt that Yelena is up to something. She dug up the truth through a medieval queen of the kingdom named Ingrid, who claims to be the first Snow Queen of Arendelle. Anna unveils that Yelena has been alive since the 1200s, and Ingrid points out that she is a manipulative sorceress that deceives powerful people to submit to her desires. Anna raises this to her sister, whom was reluctant to believe at first, but when Yelena ordered the spirits of the Enchanted Forest to attack, the sisters fight alongside once again, reigniting the Arendellian-Northuldran War of 1808. The elemental spirits were defeated, but Yelena escaped. Anna justifies King Runeard's actions as "an act of defense of the kingdom", and was absolved of his crimes.

Distraught, Elsa offers Anna her resignation, and leaves Arendelle. As Queen of Arendelle, Anna absorbs the land of the Enchanted Forest as a protectorate, and the Northuldra members who did not fought with Yelena are welcomed by Anna as citizens of the kingdom. Those who fought alongside Yelena were either executed for war crimes, or were exiled to the northernmost region of Norway.

Family, and Final Reign as Queen of Arendelle (1844)
During the peace following the Arendellian-Northuldran War, Anna conceives her first child with Kristoff. Work and duties comes first, putting a lot of strain on her. On December 22nd 1844, Anna delivers her child, but tragedy strikes when she find out that the child wasn't alive after birth. She intended to name her child after her sister. Ravaged by grief, Anna enters a state of depression. It is at this time where Anna began to question Elsa's decision to make her queen. She felt that her life was completely turned upside down when Elsa made her Queen of Arendelle.

When Elsa returned, she mustered up the courage to confront her sister in a heated argument which she prevailed over. Anna greatly forgot her duties as queen, and her vulnerable state, and with Elsa's return; King Oscar of Norway-Sweden launched a surprise attack on Arendelle. Kristoff takes over as regent, and seeing that her sister was unable to act, Elsa officially usurps the throne from her sister to defend Arendelle. The Swedish forces were defeated in a day-long battle, and the next day on Christmas Eve, Anna abdicates in favor of her sister after contemplating that she desires to serve Arendelle in different ways.

Elsa's Presumed Death, and as Sole Ruler of Arendelle and Scandinavia
On October 17, 1861, Anna's beloved sister, Elsa was slain in the Battle of the North Sea. The grief-stricken Princess, despite her refusal, was sworn in as Queen of Arendelle, and Sovereign of Scandinavia due to the ongoing war with the French Empire, and the necessity to have a ruler on-hand. But on the days following, Anna learns of Elsa's whereabouts.

The Imperial Government under Queen Anna
On November 01, 1861, Anna repeals the title "Empress" from the imperial court. Instead, she changed the title to "Grand Sovereign". The change was not clearly defined, though some speculate that this is due to Anna's own reluctance to be heralded as such. And that her sister deserves it more than she will ever do.

Scandinavia's first imperial election was held on November 20, 1861 as a continuation of Elsa's promise of flexible and open government for the people. The election was ruled to take place every four (4) years starting on November 1864, though some positions can be personally ceased by the Sovereign to retain the person in the current position, a thing that the citizens of Scandinavia did not mind as long as they are free to choice the other elected positions.