About 'Ukba ben Nechemya (Ukvan), 17th Exilarch Mar 'Ukba III
Exilarch Mar Ukba II ben Nehemiah beni David was Exilarch (Exilarch [Hebrew: ראש גלות Rosh Galut, Aramaic: ריש גלותא Reish Galuta lit. "head of the exile", Greek: Æchmalotarcha], referring to the leaders of the Diaspora Jewish community following the deportation of the population of Judah into Babylonian exile after the destruction of the kingdom of Judah) in Babylonia between 313 and 337.
Nathan de-Zuzita, according to Joseph ben Ḥama (Shab. 56b), is to be identified with the Exilarch 'Uḳban ben Nehemiah, Joseph's contemporary (first half of the 4th cent.), who was a contrite sinner.
The Seder 'Olam Zuṭa, too, in the list of the Exilarchs, mentions an Exilarch called "Nathan 'Uḳban (Nathan de-Ẓuẓita). Rashi gives two explanations for the surname "Ẓuẓita," which means literally either "sparks" or "hair". Rashi explains that in touching the angel who received his repentance Nathan 'Uḳban either emitted sparks, or the angel took him by the hair. In Sanh. 31b Rashi explains the nature of Nathan's sin and says that after Nathan's repentance a radiance was seen about his head: hence the name "de-Ẓuẓita." According to the geonim Ẓemaḥ and Saadia, Nathan 'Uḳban, when he was young, was wont to curl his hair, his surname "de-Ẓuẓita" being derived from that habit. Another interpretation is that fire would flash out from his ẓiẓit, so that nobody could stand near him.
As to the nature of Nathan 'Uḳban's sins and repentance see Rashi to Sanh. l.c. Rabbi Aḥai of Shabḥa, in his "She'eltot" (sections "Wa'era" and "Ki Tissa"), tells almost the same story as Rashi, of a man who was called "Nathan de-Ẓuẓita," but without mentioning either that he was likewise called "'Uḳban" or that he was an exilarch. Further, this story is related by Nissim ben Jacob in his "Ma'aseh Nissim," at great length, Nathan being placed in the time of Akiba—that is, not later than the first third of the second century.
It may therefore be assumed either that there were two Nathan de-Ẓuẓitas, the second being identical with the exilarch 'Uḳban b. Nehemiah, or that Joseph b. Ḥama must be understood as comparing 'Uḳban, in his repentance, to Nathan de-Ẓuẓita, who was much earlier and, perhaps, was not an exilarch. It is true that in the Seder 'Olam Zuṭa it is clearly affirmed that Nathan I was called also "'Uḳban"; but in other details the three recensions of that work disagree with Joseph ben Hama, in that they leave it to be supposed that Nathan de-Ẓuẓita was the son of Anan and not of Nehemiah, and that they represent him as the father of Huna the exilarch, who lived in the time of Judah ha-Nasi I. The Seder 'Olam Zuṭa has in its list three exilarchs called "Nathan," the second being the grandson of the first, and the third the son of Abba ben Huna and father of Mar Zuṭra; it is the chronology of Nathan III that coincides with that of 'Utḳban of Shab. 56b.
See http://en.wikipedia.org/wiki/Mar_%27Ukban_III_(exilarch) for more information.
Also see "My Lines"
from Compiler: R. B. Stewart, Evans, GA
( http://homepages.rootsweb.ancestry.com/~cousin/html/index.htm ) -------------------- Mar Ukba III Nathan, died 337, occupation: Exilarch in Bavel 313-337,
son of Nechemiah I and nn
He was Exilarch of the Jews in Babylon about 313-337.
1. Stuart, R.W. "Royalty for Commoners" line 329. 2. ..., "Encyclopedia Judiaca", Vol.6, pp.1024-1025. 3. ..., "The Jewish Enclyclopedia" Vol.V, pp.288-290. to: nn
1) Mar Abba Abra, birth 300, died 370, occupation: Exilarch Bavel 350-370 He was Exilarch of the Jews in Babylon about 350-370. Sources:
1. Stuart, R.W. "Royalty for Commoners" line 329. 2. ..., "Encyclopedia Judiaca", Vol.6, pp.1024-1025. 3. ..., "The Jewish Enclyclopedia" Vol.V, pp.288-290. He is perhaps the father of King Yezdegird's wife to: nn
'Ukba ben Nechemya, 17th Exilarch Mar 'Ukba III's Timeline
Babylon, Persian Empire