In his post-Medina days, when Islam was conquering vast territories by the sword, he signed with a palm-print an order of protection for St. Catherine's, enjoining the "faithful" from their usual slaughter and pillage. If I knew how to post pics to FR I would send you a good one of this document, which, IIRC, is written in Sinatic Greek and Arabic.
"If I knew how to post pics to FR"
I'm no good at this stuff in general, but try right-clicking on the pic. I believe you'll see a COPY option and maybe another you can use, just drag it to a Word Pad---or click it onto it.