WI Decembrist revolt succeeded

So WI this revolt in 1825 succeeded and Paul I accepted a constitutional monarchy for Russia. How would this event change Russian history

I believe you mean Nicholas I, not Paul (who died in 1801). Nicholas I would not have accepted a constitutional monarchy and the Decembrists would not have accepted Nicholas continuing as Tsar had their revolt succeeded. They wanted Nicholas' older brother Constantine to reconsider his rejection of the throne and to become Tsar.

For background: http://en.wikipedia.org/wiki/Decembrist_revolt
 
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