Definition
The term "Ommiad" is an alternate spelling of "Umayyad." The Umayyad Caliphate was a major Islamic dynasty that ruled a vast territory from 661 to 750 AD. Think of it as a historical empire with a slightly tricky spelling. They expanded the Islamic world and left a lasting architectural legacy. Knowing both spellings helps avoid confusion. It's like knowing two ways to spell someone's name.