I can't quite place the art style, but the relatively realistic way the animals are drawn makes me suspect it's quite a bit too late for our purpose, probably 16th century.
Going by the iconography, I'm pretty sure this is St Francis of Assisi preaching to the birds. But this doesn't seem to help much in tracking down the image...
Edit: sites where it appears tend to use it as an illustration of the "hortus conclusus", so it is probably not St Francis after all, but rather a monk enjoying the walled garden. None of them seem to mention sources though.
Going by the iconography, I'm pretty sure this is St Francis of Assisi preaching to the birds. But this doesn't seem to help much in tracking down the image...
Edit: sites where it appears tend to use it as an illustration of the "hortus conclusus", so it is probably not St Francis after all, but rather a monk enjoying the walled garden. None of them seem to mention sources though.