The South Caucasus was eventually fully assimilated and conquered by the Persian Achaemenids around 550 BCE.
The Seljuq period of Azerbaijan's history was possibly even more pivotal than the Arab conquest as it helped shape the ethno-linguistic nationality of the modern Azerbaijani Turks.
After decline of Abbasid Khalifate, the territory of Azerbaijan was under the sway of numerous Iranian dynasties such as the Salarids, Sajids, Shaddadids, Rawadids and Buyids.
Well before Islam arrived in the region, the region above the Aras river today known as Azerbaijan, Armenia and Georgia, was for centuries under Sassanid Iranian rule, and before that under Parthian Iranian rule.
Muslim Arabs defeated the Sassanids and Byzantines as they marched into the Caucasus region.
Which means, people relax and look forward to their holidays abroad. (This, by the way is officially prohibited by UK law.