Branch Davidians, American religious movement that became widely known in 1993, when most of its members were killed in a fire that destroyed their headquarters near Waco, Texas. The fire marked the end of a 51-day siege by United States federal agents. (Microsoft® Encarta® 98 Encyclopedia. © 1993-1997 Microsoft Corporation. All rights reserved.) The Branch Davidians trace their origins to the Davidian movement, a splinter group of Seventh-Day Adventists founded by Adventist leader Victor Houteff in Los Angeles, California, in 1934. Houte ....