If you use the mnemonic for the colours of the visible spectrum and have wondered who Riard of York was, you can watch Benedict Cumberbatch play him
http://www.bbc.co.uk/iplayer/episode/b07d3ks4/the-hollow-crown-the-wars-of-the-roses-3-richard-iii (UK only and for a couple of weeks more) To add to the confusion, he was Richard of the House of York, but in the play he is Richard, Duke of Gloucester!