Shlomo ben Aderet
Shlomo ben Aderet (Hebrew: שלמה בן אדרת) (or Solomon son of Aderet) (1235–1310) was a Medieval rabbi, halakhist, and Talmudist. He is widely known as the Rashba (Hebrew: רשב״א), the Hebrew acronym of his title and name: Rabbi Shlomo ben Aderet.
The Rashba was born in Barcelona, Crown of Aragon, in 1235. He became a successful banker and leader of Spanish Jewry of his time. He served as rabbi of the Main Synagogue of Barcelona for 50 years. His teachers were the Ramban and Rabbeinu Yona. Among his numerous students were the Ritva and Rabbeinu Behaye.
The Rashba was considered an outstanding rabbinic authority, and more than 3,000 of his responsa are known to be extant. Questions were addressed to him from Spain, Portugal, Italy, France, Germany, and even from Asia Minor. His responsa, which cover the entire gamut of Jewish life, are concise and widely quoted by halakhic authorities.
The Rashba and Rambam 
Nevertheless, the Rashba was opposed to the philosophic-rationalistic approach to Judaism often associated with Rambam, and he was part of the beit din (rabbinical court) in Barcelona that forbade men younger than 25 from studying secular philosophy or the natural sciences (although an exception was made for those who studied medicine). On July 26, 1305, the Rashba wrote:
"In that city [Barcelona] are those who write iniquity about the Torah and if there would be a heretic writing books, they should be burnt as if they were the book of sorcerers."
Other works 
The Rashba wrote several other works. They include:
- Hiddushei HaRashba, a commentary on the Talmud.
- Torat HaBayit, a manual on kashrut (dietary laws) and other religious laws that are observed at home.
- Mishmeret HaBayit, a defense against the Ra'ah's critique of Torat HaBayit.
- Sha'ar HaMayim, a work focusing on the laws of a mikvah (ritual bath).
- Avodat HaKodesh, a manual on the laws related to Shabbat and Jewish holidays.
In addition, he wrote commentaries on other subjects.
- This article incorporates text from a publication now in the public domain: Jewish Encyclopedia. 1901–1906.
In particular, the following articles were used as references:
- Shlomo ben Aderet's name may be written in many different ways. His first name is written as either Shlomo or Solomon. The next word, "ben" (which means "son of" in Hebrew) is sometimes replaced by "ibn" (the Arabic word with the same meaning) or omitted altogether. Aderet sometimes is spelled Adret or Adereth. Occasionally the name Avraham or Abraham is included before Aderet.
- H. Z. Dimitrovsky, ed. Teshubot HaRishba, Vol. 2 (Jerusalem: Mossad Harav Kook, 1990) I, Pt. I, p. 361.
See also 
- Hiddushei HaRashba (hebrew text) at Wikisource
- History of the Jews in Spain