I want to know the answer to the following question:
When did the Umayyads begin to occupy Iberia?
All the background I'm provided with is that "Marwan ibn Muhammad, the future Marwan II, finally ended the war in 737 with a massive invasion that is reported to have reached as far as the Volga, but the Khazars remained unsubdued.". Is that enough to answer the question?
Answer: no