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A prominent Napoleon expert in Russia -- who was spotted Saturday with a backpack that contained the remains of his young lover -- has confessed to murdering her, according to reports.

Oleg Sokolov, a 63-year-old professor of history at Saint Petersburg State University, “admitted his guilt” in the grisly murder of Anastasia Yeshchenko, his 24-year-old student and lover, AFP reported, citing Sokolov’s lawyer.

Investigators found Sokolov in Saint Petersburg’s icy Moika River where he was trying to dispose of the woman’s remains. He reportedly had fallen into the river drunk while dressed as Napoleon.

Oleg Sokolov, a history professor at St. Petersburg State University, speaking at a staged battle reenactment.

Oleg Sokolov, a history professor at St. Petersburg State University, speaking at a staged battle reenactment. (AP, File)

Sokolov allegedly told investigators he had shot and killed Yeshchenko during an argument, then sawed off her arms and legs, Russian media outlet 47 News reported.

Police discovered Yeshchenko’s decapitated body and a blood-stained saw at his home.

Sokolov authored multiple books on Napoleon Bonaparte and was a member of several historical societies in France. People who knew him said he was a talented lecturer but eccentric. He was known to call Yeshchenko “Josephine” – a reference to Napoleon’s first wife – and liked to be addressed as “sire.”

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Some students of Saint Petersburg State University blamed the school, alleging that complaints about Sokolov’s hostile behavior went unheeded.

“They did not pay attention to certain things,” said student Vasily Kunin. “There was a policy of hushing things up.”

Investigators, meanwhile, were searching the Moika River for more traces of Yeshchenko’s remains.

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Sokolov was being treated at a hospital for hypothermia.

A court is to decide Monday whether he should be formally arrested.