Jonathan Eybeschutz (רבי יהונתן אייבשיץ) (also Eibeschutz or Eibeschitz; 1690 – 1764) was a Talmudist, Halachist, Kabbalist, holding positions as Dayan of Prague, and later as Rabbi of the "Three Communities": Altona, Hamburg and Wandsbek. He is well known for his conflict with Jacob Emden in the Emden–Eybeschutz Controversy. Source: Wikipedia (en)