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On 9th May 1386 the Treaty of Windsor was signed between Portugal and England, uniting the two countries in a perpetual alliance.

It remains the oldest active alliance in the world.

In WW2 it would TWICE play a quiet but critical part in the allies' victory over the Axis, to the watching disbelief of Roosevelt and the Americans.

Here's how the treaty came about, was lost, almost got cancelled, then helped Britain in its darkest hour. /1 #history #histodons #portugal #uk