A member of the Decembrist movement, a group of Russian revolutionaries who rebelled against the Tsar in December 1825.
From December + '-ist' (a suffix for movement members). This refers specifically to the Dekabrists, Russian nobles who staged a famous failed uprising in December 1825 in St. Petersburg.
The Decembrists were Russia's first modern revolutionaries—educated nobles who rebelled not for themselves but for democracy and freedom—making them early symbols of political idealism that inspired later Russian reform movements.
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