A smooth card player in San Francisco in 1893 who invites the newly arrived Data into his poker game and loses heavily to him.
Frederick La Rouque is a professional gambler of the 19th century. He appears in Time's Arrow, played by Marc Alaimo, who is better known as Gul Dukat.
Data is thrown back in time to San Francisco with no money. In the hotel where he seeks a room he finds La Rouque running a poker game with a few other players, among them Joe Falling Hawk. La Rouque, who speaks with a French accent and takes Data for a fellow Frenchman, lets him play using his communicator as a stake.
The gambler expects an easy mark. Data, who has spent years at the weekly game on the Enterprise, cleans out the table. The winnings pay for his room and for the materials he needs to build a device to track the aliens who are preying on the city's sick.