Dracula's Final Defeat
A per bits of story revealed in Aria of Sorrow, in 1999 Dracula's castle once again returned to the world of men. Julius Belmont, heir to the Belmont clan and current owner of the Vampire Killer, went to the castle along with a smattering of other heroes (including a religious order headed by the Belnades clan). During the encounter, both Dracula and his demon castle were sealed within an eclipse (how one goes about sealing something in an eclipse, a shadow across the sun caused by the moon crossing in front of it, is open for debate). Julius Belmont had his memory knocked out and was left with no knowledge of the events that had just transpired.
No game currently covers the events detailed here-in. Its doubtful, at this point, that a game will be released to detail it further.
It's also worth noting that while it was first assumed the epilogue section of Lords of Shadow took place in 1999 AD (as a nice parallel to the main series), it was eventually settled that the section in question happened, in fact, in 2057 AD in that continuity.