Early in 1818 John Hamilton Reynolds, a friend of Keats, sent him two sonnets which he had written 'On Robin Hood'. Keats, in his letter of thanks, after giving an appreciation of Reynolds's production, says: 'In return for your Dish of Filberts, I have gathered a few Catkins, I hope they'll look pretty.' Then follow these lines, entitled, 'To J. H. R. in answer to his Robin Hood sonnets.' At the end he writes: 'I hope you will like them--they are at least written in the spirit of outlawry.'
Robin Hood, the outlaw, was a popular hero of the Middle Ages. He was a great poacher of deer, brave, chivalrous, generous, full of fun, and absolutely without respect for law and order. He robbed the rich to give to the poor, and waged ceaseless war against the wealthy prelates of the church. Indeed, of his endless practical jokes, the majority were played upon sheriffs and bishops. He lived, with his 'merry men', in Sherwood Forest, where a hollow tree, said to be his 'larder', is still shown.
Innumerable ballads telling of his exploits were composed, the first reference to which is in the second edition of Langland's Piers Plowman, c. 1377. Many of these ballads still survive, but in all these traditions it is quite impossible to disentangle fact from fiction.