Private User The Unbroken Chain goes back to the 15th century only.
Private User I'm looking at that page. Here is the exact text:
Ten years later,
again owing to dissensions, the exilarcli
Natronai b. Habibai was compelled to emigrate
to Africa (773). Isaac Iskawi II. (about 800) received
from Harun al-Rashid (786-809) confirmation
of the right to carry a seal of office (see Lazarus, in
"Briill's Jahrbuch," x. 177). At the court of the
mighty Harun appeared an embassy from the emperor
Charlemagne, in which a Jew, Isaac, took part
(Pertz, "Monumenta Germaniie Historica, " i. 190,
353). Charles (possibly Charles the Bald) is said to
have asked the " king of Babel " to send him a man
of royal lineage ; and in response the calif despatched
R. Makir to him (" Yuhasin, " 845) ; this was the first
step toward establishing communication between the
Jews of Babylonia and European communities.
SO:
* Natronai b Habibai is one person. He went to Africa.
* R Makir supposedly was dispatched to one of the Charles'. Which one is actually disputed. I've seen sources that say he went to Europe in the reign of Pepin the Short. From the above text there's no connection to Natronai.
* Isaac the Jew is mentioned, but there's no connection to either of the other two above.
From my understanding, there are only two or three contemporaneous sources at all for any of the above, and they're all vague.
