King Louis of England?

It is often asserted that the last invasion of England was in 1066, but this is by no means the case.
When King John's disastrous reign finally came to an end in 1216, his son and heir, Henry, was no more than nine years old, and without any sign of being a forceful character. The boy was now crowned as Henry III; but many of the barons who had rebelled against John were of the opinion that Louis, the younger son of Philip Augustus of France (the greatest of the French mediaeval kings) would make a much better King of England.
   Louis was already in England, and was willing to take the crown. But William Marshal, Earl of Pembroke, the most respected knight of his age, remained loyal to the ruling family, and attacked and defeated Louis and his supporters at Lincoln in May 1217
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Soon afterwards, French ships in the Channel were defeated off Dover. Louis withdrew to France, and as a result of the death of his brother became King Louis VIII of France in 1223. But, without the determination of William Marshal, England could easily have had a King Louis I.
   Young King Henry III now enjoyed a reign of 56 years, one of the longest in British history. But "enjoyed" is probably the wrong word, since he displayed complete ineptitude for the job. For a while he was little more than a prisoner and puppet of Simon de Montfort. But Henry's very incompetence proved to be of crucial constitutional importance, since it resulted in the first appearance of an English Parliament.