This is a traditional aid used in UK schools to help students remember the order of British Monarchs from William the Conqueror on . . .Personally I think it would just take some memorising to learn the poem off by heart,yet my Father of 78yrs of age can remember all the Kings and Queens and can recite off the top of head.

Willie Willie Harry SteeHarry Dick John Harry three;One two three Neds, Richard twoHarrys four five six....then who?Edwards four five, Dick the bad,Harrys (twain), Ned six (the lad);Mary, Bessie, James you ken,Then Charlie, Charlie, James again...Will and Mary, Anna Gloria,Georges four, Will four Victoria;Edward seven next, and thenCame George the fifth in nineteen ten;Ned the eighth soon abdicatedThen George six was coronated;After which ElizabethAnd that's all folks until her death.