Question: What did king john do to kenilworth castle?

context: No context provided
question: What did King John build on Kenilworth Castle?
short_answers: outer bailey wall in stone, and Mortimer's and Lunn's Towers
context: Henry's successor, Richard I, paid relatively little attention to Kenilworth, but under King John significant building resumed at the castle. When John was excommunicated in 1208, he embarked on a programme of rebuilding and enhancing several major royal castles. These included Corfe, Odiham, Dover, Scarborough as well as Kenilworth. John spent £1,115 on Kenilworth Castle between 1210 and 1216, building the outer bailey wall in stone and improving the other defences, including creating Mortimer's and Lunn's Towers. He also significantly improved the castle's water defences by damming the Finham and Inchford Brooks, creating the Great Mere. The result was to turn Kenilworth into one of the largest English castles of the time, with one of the largest artificial lake defences in England. John was forced to cede the castle to the baronial opposition as part of the guarantee of the Magna Carta, before it reverted to royal control early in the reign of his son, Henry III.
question: What did King John do to Kenilworth Castle in the area of water?
short_answers: improved the castle's water defences by damming the Finham and Inchford Brooks

Answer: Kenilworth Castle, in the town of Kenilworth in Warwickshire, England, was founded during the Norman conquest of England with development through to the Tudor period. The outer bailey wall in stone, and Mortimer's and Lunn's Towers were built mainly by King John. The outer bailey wall has numerous buttresses but only a few towers, being designed to be defended primarily by the water system of the Great Mere and Lower Pool. John spent £1,115 on Kenilworth Castle between 1210 and 1216,building the outer bailey wall in stone and improving the other defences, including creating Mortimer's and Lunn's Towers. He also significantly improved the castle's water defences by damming the Finham and Inchford Brooks, creating the Great Mere.