Question

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Now youare in the heart of the Tower of London. Welcome to the White Tower! They began to built this large, stone tower between 1078 and 1087. It was slowly finished after 1100. This tower is called the Tower of Power.
Why do we call it the White Tower, the stones are more grey than white? Because in 1240 King Henry III wanted to make the Great Tower white inside and outside. Now it is sometimes washed.

Answer 1

What did they start to build between 1078 and 1087?
When they began to built this thing?