I've got a relatively early printed book, from 1575. It's a book about plants [1]. It's in old french and although I'm a native french speaker it is definitely not an easy read. Now it's as alien as the old english text in TFA but then it's from 1575, not 1000. If you take "french" from 1000, I take it it'd basically as unreadable for a native french speaker as that "english" text is for a native english speaker.

[1] btw my daughter loves that book because we gave her the name of a plant and that plant is described in that old book... But I only found that out way after she was born.