Tsar Alexander killed in the Battle of Austerlitz

Why would Constantin denounce his rights to throne when POD is several years before Alexander I's OTL death?
 
Why would Constantin denounce his rights to throne when POD is several years before Alexander I's OTL death?

What would Constantine's marital endeavours look like ITTL though? He's already estranged from his first wife, so would he try and get a divorce to produce an heir, or would the throne eventually pass to Nicholas?
 
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