Dissolved by Gustav I Vasa in 1523, FTP name this 136 year union of Denmark, Sweden, and Norway.
Achieved after Albert of Mecklenburg failed to pay a tribute, its end was precipitated by the Stockholm Bloodbath, Christian II's murder of 82 noblemen.  Realized with the coronation of Erik of Pomerania, it was the driven by the ambition of Queen Maragaret of Norway and was the subject of the meeting of three Rigsraads on Trinity Sunday in 1397.  Dissolved by Gustav I Vasa in 1523, FTP name this 136 year union of Denmark, Sweden, and Norway.
Achieved after Albert of Mecklenburg failed to pay a tribute, its end was precipitated by the Stockholm Bloodbath, Christian II's murder of 82 noblemen.  
Kalmar Union