1 Anon. (1817), p. 125, the sole author to mention the earthquake, has 1091,
but elsewhere 1061 or 1071. Eckenstein (1921), pp. 144-5,
puts John's death in to 1069, which raises the possibility of the 18
March 1068 earthquake, see above. Cheikho (1907), p. 416, quotes
an Arabic manuscript that gives 1091 for his death, and this is followed by Rabino (1937), p. 82. No reference to the shock has been
found in Arabic sources for this year (484 H), or the surrounding
period, nor to the bedouin raids on the monastery that are said to
have led to the Archbishop's death.
References mentioned
Anonymous (1817) Description of the 114 Mount Sinai N. Glvka, Venice (in Greek) , p. 125
Chiekho, L. (1907) Les Archeveques du Sinai. Melanges de la Far. Orient. de l'Universite St-Joseph, Beirut, 2, 408-21. p. 416 - open access at persee
Eckenstein, L. (1921) History of Sinai. London, pp. 144-5 - open access at archive.org
Rabino, M.H.L. (1937) Le monastere de Sainte Catherine
(Mont-Sinai); souvenirs epigraphiques des anciens pelerins.
Bull. Soc. R. de Geogr. d'Egypte, 19, 21-126. , p. 82