Sarah Dunant reflects on martyrdom past and present.

As Kremlin critic Alexei Navalny is laid to rest, Sarah looks to history to ponder what his legacy might be.

And she turns to the work of the 19th-century philosopher Soren Kierkegaard: 'The tyrant dies and his rule is over...the martyr dies and his rule begins'.

'History is a long game,' Sarah writes. 'And the shelf life of martyrs in particular is impressive.'

Producer: Adele Armstrong