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Details on the area of current day France that was called Burgundy in the medieval period.
1468 Summer  Margaret marries Duke of Burgundy
 Edward arranged for his sister Margaret to marry Charles the Duke of Burgundy. Burgundy had for some time been a supporter of the Yorkists and this marriage strengthened the bond. For Warwick, this was a disaster. Warwick had been attempting to make an alliance with France and that was not about to happen. 
1470 Oct 2  Edward flees to Burgundy
 Warwick did not need to fight the King. Edward was outnumbered and was almost captured by John Neville at Doncaster. Along with his brother Richard and a small party of followers, Edward travelled to Lynn in Norfolk where he sailed to Burgundy and refuge.[1] 
 Qtr 4  Louis declares war on Burgundy
 Edward IV had taken refuge with his brother-in-law Charles, the Duke of Burgundy. Louis of France declared war on Burgundy forcing the Duke to support Edward in his attempt to reclaim the English throne.[1] 
1474 Jul  Treaty of London
 Treaty of London between Edward IV and Charles the Bold of Burgundy against France.[2] 
1475 Jul  Edward invades France
 Edward's plans to unseat the King of France led to his invasion of France with a force of 10,000 men. He had been promised assistance from the Dukes of Brittany and Burgundy, and the King of Aragon. Unfortunately the Burgundian army did not turn up due to another conflict and Edward was left without sufficient men to proceed. 
1476 Dec  Edward prevents marriage
 Isabel, the wife of George, Duke of Clarence died a few months after giving birth to her second child. Clarence chose Mary of Burgundy as his next wife. Mary was the heir to the Duchy of Burgundy and had a good claim to the English throne. Edward saw the danger of his brother marrying Mary and claiming the throne and prevented the marriage going ahead.[3] 
Early Modern Period (1500-1800)
1518 Oct  Treaty of London (Universal Peace)
 A treaty was signed in London between the major European countries, England, France, Burgundy and many more. For Cardinal Wolsey this treaty was a plan to produce a peaceful Europe. The treaty stated that the countries must not attack one another and if they did the other countries would come to the aid of those being attacked. Within the treaty was the agreement that Henry's 2 year old daughter Mary would marry the French dauphin.