A shia leader named Safi was the founder of the empire, and called himself the first King, or Shah of the empire. His descendant, Ismail I, conquered Tabriz, and made some changes in the empire. He accepted shia Islam, and made the empire safer. One very important leader, named Nadir Shah, kept Iran safe from attacks, but after his assassination, the empire had finally collapsed.
A Shah names Abbas, conquered many lands. First, he went to Herat, which is now Afghanistan, and conquered it. Then, he went back to the land called Ajerbaijan, that was already conquered in earlier times by the Muslims, and reconquered. After that, he went to Baghdad, which is mostly now, Iraq.