The Saltire is Scotland’s National Flag and the People’s Flag (The Lion Rampant is the Royal Banner). It is so-called because its cross resembles the simplest form of horse jump of crossed poles, and comes from the French, “sauteur”. However its origins are much older.
The village of Athelstaneford in East Lothian flies a Saltire with its explanation: it was during a battle there in 832 AD between the Picts and Scots against the invading Angles lead by Athelstan of Northumbria. The odds were against the defenders. Their King, Angus mac Fergus, High King of Alba (the ancient name for Scotland) prayed for victory. At that moment two clouds made the form of the cross on which Saint Andrew was crucified. Despite their smaller number, victory went to the Picts and Scots, and so, Saint Andrew was adopted as Scotland’s Patron Saint, and his cross as Scotland’s Flag, just as it was seen that day, a white Cross against a sky blue background.