The Exorcist Movies: Dominion Timeline
This chronological watch order uses Dominion: Prequel to the Exorcist to explore Father Merrin's first encounter with the demon Pazuzu before the events of the original film.
Dominion was the original vision for the prequel story before studio interference led to extensive reshoots. This timeline provides background on Father Merrin's crisis of faith and his previous battle with evil, adding context to his role in the original exorcism.
There are 4 other watch orders available - see the links up above.

Dominion: Prequel to the Exorcist
Father Merrin takes a sabbatical from the Church to pursue archaeology while struggling with his faith, leading him to encounter ancient evil forces that will test his beliefs.

The Exorcist
When a 12-year-old girl begins exhibiting disturbing supernatural behavior, her desperate mother turns to two priests who must perform an ancient exorcism to save her daughter's soul.

Exorcist II: The Heretic
Four years after her demonic possession, Regan MacNeil is plagued by disturbing nightmares, prompting a Vatican investigator and research specialist to determine if the evil has returned.

The Exorcist III
Fifteen years after the events of the original exorcism, Police Lieutenant Kinderman investigates a series of brutal murders that bear an unsettling resemblance to the methods of a supposedly dead serial killer.
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Asia Argento
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Bryan Edgar Wallace
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Halloween
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Invasion of the Body Snatchers
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Romero's Living Dead
George A. Romero's groundbreaking zombie saga, featuring classic horror films and several reboots.