Who said "I have conquered the greatest enemy: death itself."?

This quote is attributed to Palpatine.

I have conquered the greatest enemy: death itself. - Palpatine

"I have conquered the greatest enemy: death itself."

Palpatine Death

"Did you ever hear the tragedy of Darth Plagueis the Wise?"

"The dark side of the Force is a pathway to many abilities some consider to be unnatural."

"Have you ever heard of the tragedy of Darth Plagueis? I thought not."

"Unlimited power!"

"Death doesn't scare me anymore."

"Death and I are old friends."

"Welcome to my world."

"Death is just the beginning."