1911 Encyclopedia Britannica
AMRAM (d. 875), a famous gaon or head of the Jewish Academy of Sura (Persia) in the 9th century. He was author of many "Responsa," but his chief work was liturgical. He was the first to arrange a complete liturgy for the synagogue, and his Prayer-Book ( Siddur Rab Amram ) was the foundation of most of the extant rites in use among the Jews. The Siddur was published in Warsaw in two parts (1865).
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Chisholm, Hugh, General Editor. Entry for 'Amram'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/a/amram.html. 1910.