Found via Christopher Dickey's blog: The Shadowland Journal: Of Persians, Poker, Bluster and Bluffs:
..At least 250 years before our country was founded, Persians were playing bluff-based card games with decks of four suits: coins, goblets, polo mallets and scimitars. In the late 18th century, their vying game As-Nas (My Beloved Ace) became the prototype for the 20-card French game poque. Introduced by Napoleon's troops to New Orleans, poque evolved into 52-card poker on Mississippi steamboats in the decades after the Louisiana Purchase. Union and Confederate soldiers played the game between battles, then brought it home to every state and territory. By 1970, when the first World Series of Poker was hosted by Benny Binion at his Horseshoe Casino in downtown Las Vegas, the variation of choice was no-limit Texas hold 'em. During the next 36 years, the number of challengers in the main event mushroomed from seven to 8,773, including players from 56 countries. But only one country besides the U.S. has produced more than one champion: Iran."
Oh, and a note to some secret friends: it seems that Iran *did* indeed invent poker.