Short answers, pulled from the story.
The Safavid dynasty ruled from 1501 to 1736, with a brief restoration from 1729 to 1736 and 1750 to 1773 before finally collapsing in 1736. The dynasty began in the year 1501 when Ismail I crowned himself Shah of Iran and ended with the final collapse in 1736.
Ismail I founded the Safavid dynasty in 1501 and emerged from the city of Ardabil in Iranian Azerbaijan. His family originated from the rugged terrain of Kurdistan where they had served as Sufi mystics for generations before establishing the state.
The Qizilbash were a religious militia of Turkoman tribes who played a crucial role in the early expansion of the Safavid empire by defeating the Aq Qoyunlu. They wore red hats with twelve folds to symbolize the twelve Imams of Shi'a Islam and provided the military power necessary to establish Safavid control over Persia.
Shah Abbas I ruled from 1587 to 1629 and transformed Isfahan into the capital by moving it from Qazvin to create a jewel of the Islamic world. He centralized power, reduced the autonomy of the Qizilbash, and established a standing army loyal to the throne while commissioning grand architectural works like the Naqsh-e Jahan Square.
The Safavid dynasty adopted Twelver Shi'a Islam as the official religion of Iran in 1501 to create a lasting divide between Sunni and Shi'a communities and define the identity of the state. This religious transformation served as a political strategy that provided the bond required to hold together the fundamental elements of the Safavid state and legitimize their rule through a claimed genealogical link to the third Shia Imam.
The decline of the Safavid dynasty was driven by internal strife, external pressures, and the failure of successive rulers to maintain the strength of the state. The harem system created a cycle of weak and ineffective rulers who were often manipulated by court factions, leading to the final collapse in 1736.