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There is a legend: in XIII the Vikings landed on the coast in the eastern part of Scotland for the purpose of robbing and seizing territory. The Scots gathered their army to fight back. The Scottish army was very tired after a long journey. They made camp, not expecting the battle to begin until the next morning.
But the Vikings were very close and noticed that there were no sentries in the Scottish camp. They crossed the river Tay, hoping to capture the Scots by surprise, and lest their footsteps be heard, the Scandinavians took off their shoes and crept almost silently. But one of the Vikings stepped on a thistle, and a sudden and sharp pain made him scream. This scream was a wake-up call for the Scots, who won a fair fight. In gratitude for the help the thistle gave them, the Scots chose this plant as their national emblem.
In addition, the Scots decided that their character was very similar to the "nature" of the thistle. That they were just as unapproachable, proud, and unpretentious.