Great Tom is the hour bell in Tom Tower, at Christ Church, Oxford.
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The foundry produced "Great Tom" at Lincoln Cathedral, which can be heard from a distance of 13 miles, the "Clock Bells" at St Paul's Cathedral, the bells of Westminster Abbey and the 13 bells located at Liverpool's Anglican cathedral which are notable for being the heaviest change-ringing peal of bells in the world.
Originally called "Mary", Great Tom used to hang in Osney Abbey, until in 1545 it was moved to St Frideswide's church, after which at some point it was renamed "Tom".