In the spring of 1540 Thomas Cromwell was at the height of his power, but just a few months later he found himself at the scaffold on Tower Hill preparing to be executed for treason and heresy. What had gone so badly wrong for Henry VIII's right-hand man? As the BBC drama Wolf Hall returns for a second series, Rob Attar speaks to Cromwell biographer Diarmaid MacCulloch about the precipitous downfall of a man who seemed to have it all.

The HistoryExtra podcast is produced by the team behind BBC History Magazine.

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