BoB is correct. It is pointed out in one of the first Analects availible, even before you head into the Subterra.

It was the Great and Hallowed Pulse who, seeking to expand divine domain, parted the chaos and fashioned realm within; made fal'Cie, and charged them with this world's completion.
The fal'Cie, anxious to please the hand that shaped them, labored devotedly at the task they had been given. They made l'Cie of men so that they, too, might be able to aid the greater cause. Men, in turn, offered praise and prayer to Hallowed Pulse, naming their great land in honor of its architect.
Yet still the architect departed.

-- On the Nature of Fal'Cie

That specifically states that Pulse created fal'Cie, which makes Pulse the Maker.