Question: What year was Queen Margaret crowned?
About the article "Norway", section "Kalmar Union".

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Dancehall Queen Stacey was crowned Dancehall Queen in 1999  
  Margaret of Scotland (ruled 25 November 1286 – 26 September 1290) - also known as "Margaret, Maid of Norway".
She was daughter of Eric II of Norway and Margaret of Scotland and was named ""domina" and right heir" of the Kingdom of Scotland by her grandfather, Alexander III.
Her death while en route to Scotland sparked off the disputed succession, which led to the Wars of Scottish Independence.
As Margaret was never crowned or otherwise inaugurated, and never set foot on what was then Scots soil during her lifetime, there is some doubt about whether she should be regarded as a Queen of Scots; this could ultimately be a matter of interpretation.
Most lists of the monarchs of Scotland do include her, but a few do not.
Mary I of Scotland (ruled 1542–1567) - better known as "Mary, Queen of Scots"; she was executed in England in 1587  
The last King of the House of Dunkeld was Alexander III.
His wife had borne him two sons and a daughter; but by 1286 his sons were dead and his daughter, Margaret, had borne only a single daughter, also named Margaret, to her husband Eric II of Norway before herself dying.
Alexander had himself remarried, but in early 1286 he died in an accident while riding home.
His wife, Yolande of Dreux, was pregnant; but by November 1286 all hope of her bearing a living child had passed.
Accordingly, in the Treaty of Salisbury, the Guardians of Scotland recognised Alexander's three year old granddaughter, Margaret of Norway, as Queen of Scots.
Margaret remained in her father's Kingdom of Norway until Autumn 1290, when she was dispatched to Scotland.
However, she died on the journey in Orkney, having never set foot on Scottish soil, and without being crowned at Scone.
She is thus sometimes not considered Queen. 
On 12 February 1424 at St Mary Overie Church in Southwark, Joan married James I.
She was crowned queen consort on 2 or 21, May at Scone Abbey.
They were feasted at Winchester Palace that year by her uncle Cardinal Henry Beaufort.
She joined her husband on his return from captivity to Scotland that year.
At his coronation at Scone, when James received the allegiance of his Tenants-in-chief, he had them swear their allegiance to Joan as well, as if she was a co-monarch.
As queen, she often pleaded with the king for those who might be executed.
The royal couple had eight children, including the future James II, and Margaret of Scotland, spouse of Louis XI of France. 
She was born at Windsor Castle, the daughter of King Alexander III of Scotland and his first wife, Margaret of England.
Margaret came to Norway at 20 years of age to marry the 13 year old king Eric Magnusson.
Eric became king of Norway on 9 May 1280.
A marriage contract was signed in royal burgh of Roxburgh on 25 July 1281.
The treaty also included a provision for the children of Margaret and Eric to succeed to throne of the kingdom of the Scots.
Margaret's dowry was set at 14,000 marks sterling.
The year after the wedding was held in Bergen, Norway when Margaret was also crowned queen.
The marriage between Margaret and Eric stands out as a typical marriage of political note.
It would reconcile and resolve the Scottish-Norwegian antagonisms that had developed since 1266 resulting from the terms of the Treaty of Perth.
Under the treaty, Norway had given up the Hebrides and the Isle of Man to Scotland, in return for a lump sum of 4000 marks and an annuity of 100 marks.
Scotland also confirmed Norwegian sovereignty over Shetland and Orkney Islands.
Queen Margaret died in Tønsberg, during or shortly after giving birth to Margaret, Maid of Norway, who would become queen regnant of the Kingdom of Scotland upon the death of her grandfather, King Alexander III on 19 March 1286.
Queen Margaret was buried in the Old Cathedral on Holmen in Bergen.
This cathedral was demolished in 1531.
The site, in present day Bergenhus Fortress, is marked by a memorial.