Timeline of Marienbourgish history

This is a timeline of Marienbourgish history, comprising important legal and territorial changes and political events in Marienbourg since its creation.

21st century

Year	Date	Event
2022	26 December	António and Edson Carvalho, maternal great-uncles of Arthur van der Bruyn, sign, together with their great-nephew, a treaty granting the latter sovereignty over the properties the former jointly own in the Brazilian municipality of Poços de Caldas. As a direct consequence, they declare those territories to be, by right of possession, entirely sovereign and, therefore, separate from the sovereignty of Brazil.
2023	9 January 2023	• Arthur van der Bruyn, Sovereign of his maternal family's properties in Poços de Caldas, proclaimed the foundation, in that territory, of the Duchy of Marienbourg, assuming the throne and the title of Duke of Marienbourg. By family agreement, he establishes the House of Bruyn-Carvalho, a cadet branch of the House of Bruyn, of which he is an agnatic member, united to the Carvalho family, his maternal family and holder of the properties that form the new sovereign state.  • Decree No. 1 established the Constituent Assembly; Gustave Lynch was appointed Leading Minister and Jonathan Scherer Head of the Provisional Legislature of the Provisional Government  • The honorific orders of Marienbourg are formally established.  • The Ducal Army is formally established.  • The Kingdom of Ebenthal becomes the first sovereign entity or state to formally recognize and establish bilateral diplomatic relations with Marienbourg.
2023	20 January	The initial draft of the Constitution of Marienbourg is finalized.
2023	22 January	The draft Marienbourg Constitution, officially the Political Instrument of the Bases of the Duchy, is presented to the Constituent Assembly.
2023	1 February	• The Constitution of Marienbourg is ratified by the Constituent Assembly. Gustave Lynch, who had been acting as Leading Minister, is extraordinarily appointed as Minister-President of Marienbourg by the Duke and tasked with forming the first Council of Ministers under the Popular Party, which he founded that same day, until the holding of the first 2023 Marienbourgish general election on 9 February.  • Other institutions formally established include the Ducal Bank.
2023	7 February	The Democratic Union, a political party opposing the appointment of the provisional government entirely among members of the Popular Party, is founded by Gabriel Torres.
2023	9 February	• The 2023 Marienbourgish first general election takes place; both the Popular Party and the Democratic Union win the same number of seats, but the former remains in power thanks to the Duke's appointment of two more party members to the Ducal Diet, the unicameral parliament opened on the same day.  • Elisabeth Garcia is appointed the first Triumvir Judge of the Supreme Ducal Court, innaugurated that day.
2023	2 March	The Marienbourgish Aerospace Research Institute and Agency is established.
2023	1 May	The Marienbourgish Thaler is established as Marienbourg's sole legal tender and inner currency.
2023	10 June	The Ducal Diet voted to extend parliamentary terms from six months to one year, without success.
2023	7 July	The Government of Marienbourg started to require self-declared vaccination data as a requirement to continue the citizenship application process. Those who, self-declared, were not vaccinated against COVID-19, or who had never received any vaccine, or who did not agree with the quasi-global policy of mandatory vaccination had their citizenship applications rejected.
2023	8 August	The 2023 Marienbourgish second general election takes place; all candidates elected in the first general election were re-elected and therefore there were no changes in parliamentary seats.
2023	18 August	Bill No. 60 was approved and converted into Law No. 44, better known as the Parliamentary Expansion Act, expanding the number of seats in the Ducal Diet from 8 to 10, reducing the proportion of Diet members appointed by the Duke from 1/3 to 1/5 and establishing rules so that this appointment does not disrupt the electoral results.