Deep in a single square metre of trench D at Landsjö castle, on the inner edge of the dry moat, we found five identical coins. Boy are they ugly. They're thin, brittle, made of a heavily debased silver alloy and struck only from one side; they bear no legend and the image at the centre is incomprehensible. But I love them anyway, because they offer a tight date: this coin type was struck for King Valdemar Birgersson c. 1250-75. And the first written mention of Landsjö dates from 1280, so it all works out.