The associated yeshivas of Sura and Pumbeditha (both in modern–day Iraq) achieve Diaspora–wide prominence in this period. (Diaspora meaning “exile,” referring to the Jews spread around the globe, post Babylonian–exile
c. 586 BCE, and Roman–exile c. 70 CE)
Rav Amram Gaon of Sura compiles his Siddur (prayer book) in 846 CE; Rav Saadia Gaon, his own in 940 CE.