depends how far you want to go back. Olives have been indigenous to Europe since at least the neolithic, but before that they were indigenous to North Africa and the (green) Sahara. It was impossible for olives to grow even in Southern Europe during the ice age.

European biodiversity, if you trace it back, is almost all from Africa or Southwest/Central Asia, for the simple fact that the subcontinent was mostly ice until only 12,000 years ago. European people also derive only 20% of their genes from ice age Europeans as well.

However most of the stuff in my OP is about more recent arrivals from the last 2,000 years

sheep are from the Middle East originally, but there are naturalized post-neolithic breeds from all over the world