King Gustav IV Adolf of Sweden abdicates after a coup d'état.

Gustav IV Adolf or Gustav IV Adolph was King of Sweden from 1792 until he was deposed in a coup in 1809. He was also the last Swedish monarch to be the ruler of Finland.

Abdication is the act of formally relinquishing monarchical authority. Abdications have played various roles in the succession procedures of monarchies. While some cultures have viewed abdication as an extreme abandonment of duty, in other societies, abdication was a regular event and helped maintain stability during political succession.

A coup d'état, or simply a coup, is typically an illegal and overt attempt by a military organization or other government elites to unseat an incumbent leadership. A self-coup is said to take place when a leader, having come to power through legal means, tries to stay in power through illegal means.

March 29 is the 88th day of the year in the Gregorian calendar; 277 days remain until the end of the year.