In 1165 an invading English army was ambushed by Welsh forces in the wooded Ceiriog Valley. A brutal battle ensued and the dead were buried nearby, at the ‘Gap of the Graves’, or Adwy’r Meirwon in Welsh. The only living witness to this battle, the battle of Crogen, is this oak tree. Standing where it does, by a public highway, on the Offa’s Dyke Path and on the site of a famous battle, it is a well-known landmark and much valued by the local community. It is now something of a celebrity, having featured on many TV programmes. It even has its own Facebook page, one of the first trees in the world to do so!