List of Scottish monarchs
The Kingdom of the Picts just became known as Kingdom of Alba in Gaelic, which later became known in Scots and English as "Scotland"; the terms are retained in both languages to this day. By the late 11th century at the very latest, Scottish kings were using the term "rex Scottorum", or King of Scots, to refer to themselves in Latin. The Kingdom of Scotland was merged with the Kingdom of England to form a single Kingdom of Great Britain in 1707. Thus Queen Anne became the last monarch of the ancient kingdoms of Scotland and England and the first of Great Britain, although the kingdoms had shared a monarch since 1603 (see Union of the Crowns). Her uncle Charles II was the last monarch to be crowned in Scotland, at Scone in 1651. He had a second coronation in England ten years later.
Isabel Bruce
Isabel was king Erik's second wife, he having previously been married to the daughter of King Alexander III of Scotland, Margaret of Scotland, who died in childbirth in 1283. Upon the death of King Alexander three years later, his granddaughter, Eric's daughter Margaret, Maid of Norway became heir to the throne of Scotland. King Eric arranged the marriage of his daughter to the English King Edward I's son Edward, which became moot upon the child's death in 1290. The death of Queen Margaret left Scotland without a monarch, and at the mercy of Edward I of England. 
Soon, John Balliol tried to take the Scottish crown with the aid of John Comyn, the Red Comyn. The Bruce family captured strongholds in Galloway, and fighting in the name of the Maid of Norway (Margaret), suppressed the rebellion with many important families like the Stewards supporting them. At the time of Isabel's marriage in 1293, her brother was one of the claimants to the Scottish throne. The Bruces were aligned with King Edward against King John Balliol and his Comyn allies. In 1306, Robert the Bruce was chosen to be King of Scot. British historian G.W.S. Barrow observed that King Eric's renewed contacts with Scotland "increased the ties of friendship which bound him to the English king."