Question

what was one cause of the decembrist revolt

Answer 1

In December of 1825 in St. Petersburg, Russia, a group of military officials staged a revolt against Tsar Nicholas I.  These rebels were liberals who felt threatened by the new ruler's conservative views.  They were, however,defeated by the tsar's forces.  As a result of this revolt, Nicholas I implemented a variety of new regulations to prevent the spread of the liberal movement in Russia.