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Belphegor is a member of the Independent Vongola Assassination Group, Varia. Once a Prince at 8 years of age of an unnamed country, he stabbed his older Twin brother, Rasiel  and was presumed dead. He is known as "Prince the Ripper" because of this event. However during the Future Arc it was revealed that Rasiel didn't die that day and is still alive and is one of the Fake Funeral Wreaths of the Millefiore Famiglia.

Source from Wikipeida