RAPID CITY, S.D. (AP) — A group of horseback riders is traveling to the Fort Laramie National Historic Site to commemorate the 150th anniversary of the 1868 Treaty of Fort Laramie's signing.

Percy White Plume of the Horse Spirit Society says riders started from Wounded Knee in South Dakota. More participants joined at Fort Robinson in Nebraska.

The riders and others are gathering at Fort Laramie National Historic Site in Wyoming for events to remember the treaty. The peace agreement with the United States deeded rights to lands, including the Black Hills, to the Lakota.

But the discovery of gold in the Black Hills brought hordes of settlers, and the government seized the land in 1877.

The Fort Laramie historic site will host a tribal encampment and events from Saturday until Tuesday.