Ivan Bartley is a character in the graphic novel Castlevania: The Belmont Legacy, published by IDW. He was an arrogant noble of a house in opposition to the Belmont Family and the uncle of Sona Bartley. He has strong ties with Dracula.
Unfortunately, Dracula's strength fails to return, prompting Sona to usurp her uncle and offer her own blood to restore Dracula fully.
While he's never seen again following Sona's usurpation, it can be assumed that he either met his end at Dracula's hands or he was killed shortly after the vampire's death. Alternatively, as he's likely related to Elizabeth Bartley in some way, he may have escaped to inform her of what transpired.