Decembrist

Thus on the death of Alexander I in 1825 the succession of his brother Nicholas I was delayed and confused by doubts over the heir and was marked by the bloody mutinies of the Decembrists; Nicholas died during the Crimean War when a contemporary wrote that his only choice was between abdication and death; his son, Alexander II, was assassinated by terrorists a quarter of a century later.

Source: wiktionary

2003, Catherine O'Neil, With Shakespeare's Eyes: Pushkin's Creative Appropriation of Shakespeare, University of Delaware Press, Associated University Presses, page 81, Many of the Decembrists listed Pushkin's poetry as a source for their "free-thinking," and there were reports of frightened people (Pushkin himself was one of them) hastily burning unfinished poems that had circulated in manuscript.

Source: wiktionary

These liberal revolutionaries, who have gone down in history as the Decembrists, called on the army not to swear allegiance to Nicholas. The Decembrist-led rebels were surrounded by troops loyal to Nicholas on the banks of the Neva River in St. Petersburg.

Source: wiktionary

The word civicism (grazhdanstvennost’) originated in the enlightenment ideal of civic Rome, perceptions of the poet as a patriotic citizen and son of the fatherland, and Decembrist dreams of a republic.

Source: wiktionary