In 960 C.E. (4720) a ship carrying four great rabbis was apparently sent on a fundraising mission for the Babylonian Yeshiva of Sura to more affluent Western countries around the Mediterranean in order to raise funds.
a) Rabbi Nissan Mindel of Chabad writes; "By divine providence, these great Jewish centers received great spiritual leaders in a most amazing and unprecedented way..." (Emphasis mine.)
8. The Chazon Ish, although ironically a staunch believer in a very literal interpretation of the tradition or mesorah concept see here (and may therefore not have paid heed to R. Chushiel's newly discovered old letter - since it was out of the 'line of transmission' for so long), had this to say about recording history in general:
"History informs the path of the wise man. However, it is the nature of people to innovate and embellish (history) when presenting it at the public arena. This compounds distortion instead of accurately recording facts. And for the most part, people relish these distortions and imaginings. Thus a concerted effort must always be made to establish historical facts."
(Loose translation of Emuna uBitachon, Ch. 1, 8)
 The Destiny Foundation, Init 2, The Legend of the Four Captives
Text from Sefer haKaballah: