The Persian Dynasties refer to a series of ruling families in ancient and medieval Persia, now known as Iran. The most notable dynasties include the Achaemenid Empire, founded by Cyrus the Great in the 6th century BCE, which expanded to become one of the largest empires in history. Other significant dynasties include the Sassanian Empire, known for its cultural achievements and conflicts with the Roman Empire. Throughout their history, Persian dynasties contributed to advancements in art, architecture, and governance. The Qajar Dynasty and the Pahlavi Dynasty were prominent in the 19th and 20th centuries, respectively, shaping modern Iran's political landscape. Each dynasty left a lasting legacy on Persian culture and society.