Heinrich Rantzau
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Heinrich Rantzau or Ranzow (Ranzovius) (1526-1598) was a German humanist writer and statesman, a prolific astrologer and an associate of Tycho Brahe. He was son of Johan Rantzau. He was Governor of Holstein, a rich man and celebrated book collector, and a patron of scholars. His Tractatus astrologicus de genethliacorum thematum appeared in 1597, and went through five editions by 1615.