Castlevania History

Castlevania Retrospective (by GameTrailers)
5 part video series on the history of Castlevania from it's NES debut, up until Lords of Shadow.

Castlevania Alternate Retrospective (by strafefox)
A shorter Castlevania Retrospective video series covering the history of Castlevania.

Castlevania & History Special (by Did You Know Gaming)
A Castlevania History Video.

Who Made Castlevania? (by GameTrailers)
A short video discussing how it is completely unknown as to who worked on the original Castlevania game.

Castlevania Radio Drama: Nocturne of Recollection
English translation of a Japanese radio drama taking place shortly after the events of Symphony of the Night.