Nietzsche extended Byron’s Satanic pride into a direct denial of gods.

Evidence

Byron, though he felt himself the equal of Satan, never quite ventured to put himself in the place of God. This next step in the growth of pride was taken by Nietzsche, who says: ‘If there were Gods, how could I endure it to be not God! Therefore there are no Gods.’ — Bertrand Russell, History of Western Philosophy, 2714

Categorization

• corroborated: 2 independent passages support this claim — Bertrand Russell, History of Western Philosophy, 2714
• XREF: connects to: Calvinistic predestination of sin drove Byron into theatrical rebellion and remorse. — Bertrand Russell, History of Western Philosophy, 2713