Short answers, pulled from the story.
The Safavid dynasty was the ruling dynasty of Safavid Iran and one of Iran's most significant ruling dynasties, reigning from 1501 to 1736. It is often considered the beginning of modern Iranian history and is counted among the gunpowder empires.
Shah Ismail I established the Twelver denomination of Shi'a Islam as the official religion of the Persian Empire in 1501. He reigned from 1501 to 1524 and was the first of eleven Safavid Shahs of Iran.
The Safavid dynasty originated in the Safavid Sufi order, established in the city of Ardabil in the Iranian Azerbaijan region. Scholars agree the family hailed from Iranian Kurdistan before moving to Iranian Azerbaijan and settling at Ardabil in the 11th century CE.
The Safavid dynasty was an Iranian dynasty of Kurdish origin, traced in pre-1501 manuscripts to the Kurdish dignitary Firuz-Shah Zarrin-Kolah. During their rule they intermarried with Turkoman, Georgian, Circassian, and Pontic Greek lines, and they were Persian-speaking as well as Turkish-speaking and Turkified.
The Safavids altered the Safvat al-safa, a hagiography composed by Ibn Bazzaz in 1350, to shift their source of legitimacy from the Chinggisids to the Alids after capturing the Iranian throne in 1501. The first alterations changed their Sunni Kurdish background to Arab descent from Muhammad, and a 1508 alteration connected their lineage to the seventh imam Musa al-Kazim.
The Safavid dynasty revived Iran as an economic stronghold between East and West, established an efficient state and bureaucracy, and made Twelver Shi'ism the state religion of Iran. They spread Shia Islam across the Middle East, Central Asia, the Caucasus, Anatolia, the Persian Gulf, and Mesopotamia, and laid the groundwork for the Iranian nation-state.