Today in History, May 28, 1503:
King James IV of Scotland and Margaret Tudor of England marry, fulfilling an international agreement which had been sanctioned by the Pope, The Treaty of Perpetual Peace between England and Scotland.
As it turns out, “perpetual” peace is good for about 10 years. In 1513 James declares war on England in support of France, who Scotland had a previous treaty with…and England had declared war on France.
The Pope would excommunicate James IV for going back on his word, and he would soon die during the Battle of Flodden Field, becoming the very last Monarch of the British Empire to die in battle.