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Arsenius Talvaren
From Warhammer 40k - Lexicanum
Arsenius Talvaren was a traitor best known for his failed attempt to open a permanent gateway to the Eye of Terror centred on Holy Terra itself, which would have allowed the Warp to flow directly onto the planet. Although Talvaren was stopped by the Inquisition on Luna, it was suspected that the demands of the ritual would have destroyed him anyway. Talvaren's attempt was doomed from the start; for he had overreached himself, and could not possibly master the forces necessary for such a feat.
However, Talvaren's underlying theory was entirely sound from an arcane standpoint. It was used again by the Thousand Sons in M41 when they created a bilocation between the planet Charys and a daemon world within the Eye of Terror.