R. Simuna (or Semona,[1] or Simona,[2]Hebrew: רב סימונא, read as Rav Simuna; Alternative Hebrew spelling: רב סמוניה, רב סמונא, רב סימוניא, רב סמוניא) was a Jewish Savora sage of the second generation of the Savora era. He headed the PumbeditaYeshiva parallelly to Rav Ena running the Sura academy, and both committed the Talmud to writing.[1] Some scholars identify him with Rav Giza (רב גיזא). Died in year 540 ( ד'ש'; Hebrew calendar).