Tradition relates that in AD 735 the king of the Picts, 'Aengus MacFergus', with the support of 'Scots' from Dalriada, won a great battle against King Athelstane of the Northumbrians. The site of the legendary battle became known as Athelstaneford in present-day East Lothian.
It is said that before the battle, King Aengus dreamt of St Andrew bearing his Saltire cross. According to the legend, during the battle Aengus saw a cross of white clouds against a blue sky.
The Picts and Scots won the battle. The Saltire - a white diagonal cross on a blue background - became the flag of Scotland and St Andrew was adopted as Scotland’s patron saint.
The Scottish Flag Heritage Centre in Athelstaneford, near Haddington in East Lothian, tells the story of King Aengus and the Battle.
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