The first clock tower was erected in New Palace Yard. It had one dial and a bell
The early clock tower was replaced with a new tower and clock. This was the first public chiming clock in England.
The clock tower had fallen into disrepair. Its bell was sent to St Paul's Cathedral but broke en route
The medieval clock tower was pulled down and a sun dial put up in its place
The bell from the clock tower was recast and later hung in the South West Tower of St Paul's Cathedral. If Big Ben is ever unable to strike, the bell in St Paul's is heard instead
The Palace of Westminster was almost completely destroyed by fire