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Appears in Harry Potter and the Dark Lord's Downfall.
This article concerns the Harry Potter: The Dark Lord's Downfall version of Jacob Blackheart; you may be looking for other canon and fanon versions.
Jacob Blackheart (b. 1939) was a Pureblood wizard. Born in Portugal to Josephus and Terezinha Blackheart. He is the father to Serefina Blackheart, grandfather to Phoebe Blackheart and Aiden Chamberlain and husband to Elena Blackheart.