Simeon ben Zemah Duran, also Tzemach Duran (1361–1444; Hebrew: שמעון בן צמח דוראן), known as Rashbatz (רשב"ץ) or Tashbatz, was a rabbinical authority, student of philosophy, astronomy, mathematics, and especially of medicine, which he practised for a number of years at Palma de Mallorca. A major 15th century posek, his published decisions in matters of halakha have been widely quoted in halakhic literature for hundreds of years.
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