The Victorians, as with many parts of our History, romanticised The Prince of Wales, Prince Edward, by calling him the 'Black Prince'. That is also how the 'War of the Roses' so became named.
And the Boy King, Richard II had a lot on his plate, the poor bugger.
Not only did he have to try and trust those around him (he became King at the age of 10), to guide him in the right direction, but he also had to deal with the Black plague and all that entailed.
Poor bugger didn't stand a chance....