British prosecutors say 37-year-old Mark Colborne wrote in his diary of plans to assassinate the heir to the British throne with a high-powered rifle, and compared himself to Norwegian mass killer Anders Breivik.
He also wrote of carrying out a cyanide attack on "non-Aryans" and collected chemicals and books on poisons.
Prosecutors say Colborne felt alienated and marginalized as a white, red-haired man. He claimed in his defense that his writings were "angry rants" made when he stopped taking medication for depression.