When Henry III became King he began improving of the area of the castle between the Tower and the river by building the Wakefield and Lanthorn Towers. Henry used the Wakefield Tower, which is the second largest tower of the castle, as he own private residence. Between 1275 and 1285 Edward I spent large sums of money improving the fortifications. A new moat was dug and a curtain wall was built around it. The land between the Tower and the river was levelled and new apartments were built on the shore. Edward had a complex of gates added which meant it was extremely difficult to attack the castle through the main land entrance.