The manga series Hellsing, created by Kouta Hirano, was first serialized, marking the beginning of the franchise.
The Hellsing anime television series was first aired, expanding the franchise's audience.
The Hellsing Ultimate OVA series, a more faithful adaptation of the manga, began releasing.
The final episode of the Hellsing Ultimate OVA series was released, concluding the animated adaptation of the full manga story.