Simeon Kayyara, also spelled Shimon Kiara (Hebrew: שמעון קיירא), was a Jewish-Babylonian halakhist of the first half of the 8th century.
The early identification of his surname with "Qahirah," the Arabic name of Cairo (founded 980), was shown by Solomon Judah Loeb Rapoport[2] to be impossible.
It is now assumed that "Kayyara" is derived from a common noun, and, like the Syro-Arabic "qayyar," originally denoted a dealer in pitch or wax.
[4] According to both medieval authorities like Geonim Sherira and Hai ben Sherira, and modern scholars like Abraham Epstein, Kayyara is the author of Halachot Gedolot (הלכות גדולות), a work on Jewish law dating from the Geonic period.
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