Dosa ben Saadia (Hebrew: דּוֹסָא בֶּן סַעֲדְיָה, romanized: Dosā ben Saʿăḏyā; Arabic: دوسة بن سعيد الفيومي, romanized: Dawsa bin Saʻīd al-Fayyūmi; c. 935 – 1018) was a Talmudic scholar and philosopher who was the Gaon of Sura from 1012 until his death in 1018.
This has led scholars to place Dosa's birth around 935, meaning that he was only a young boy when his father died in 942.
[1] Most scholars have identified Dosa as being identical with David ben Saadia, who wrote several Talmudic work in Arabic.
Only a few of Dosa's responsa's survived, and the ones that did, reflect the modern Halakic stance that defined his father.
A more unusual aspect of his life, Dosa had taken an oath in his teenage years to refrain from eating bread as an act of asceticism, which he apparently continued until his death in 1018 in Baghdad.