The 7th century Syriac father Severus Sebokht has left several scientific and philosophical works behind. I grew interested in him, enough to acquire a PDF of the main manuscript of his mostly unpublished works, but other things supervened and I never pursued the matter. There are several unpublished letters in the ms. (BNF Syriac 346), one of which is the earliest mention of what we now call Arabic numbers in the west. The letter has never been translated, tho.
David Bertaina has posted on the Hugoye list a query about him. Apparently he has a post-grad. student who read mathematics, and is interested in having a go at his works. This is very good news, if so, and I have written to encourage him and offer support.