Voldemort’s grandfather. Marvolo is the scion of the Gaunt family, which was once wealthy and prestigious but has now lost its status and developed a reputation for inbreeding and insanity. Despite the squalor in which he lives, Marvolo is fixated on his family pedigree and teaches his children, Morfin and Merope, to despise Muggles and think well of themselves because of their pureblood heritage. Although Voldemort never meets his grandfather, he inherits his feelings of uniqueness and entitlement and his belief in the superiority of pureblood wizards.
Marvolo Gaunt Character Timeline in Harry Potter and the Half-Blood Prince
The timeline below shows where the character Marvolo Gaunt appears in Harry Potter and the Half-Blood Prince. The colored dots and icons indicate which themes are associated with that appearance.
Chapter Ten: The House of Gaunt
...entering the house, saying he’s here to investigate a “serious breach of Wizarding law.” Reluctantly, Mr. Gaunt allows Ogden to enter the grim and dirty cottage, where Morfin sits on a couch... (full context)
...performing magic in front of a Muggle last night. Merope suddenly drops a pot and Mr. Gaunt excoriates her, calling her a “useless sack of muck,” laughing further when she tries and... (full context)
...in Parseltongue, saying that the Muggle clearly has a girlfriend, and would never like her. Mr. Gaunt asks Morfin what he’s talking about, and the son says viciously that Merope is always... (full context)
...Merope survived. Dumbledore responds that Ogden soon returns with reinforcements; both Morfin and his father, Marvolo, do stints in Azkaban for their history of Muggle attacks. Recognizing the name, Harry realizes... (full context)
Chapter Thirteen: The Secret Riddle
Chapter Twenty-Three: Horcruxes