On June 6, 2018, Clare “Kitty” Weaver poses next to the first public display of her ancestor’s copy of the Navajo Treaty of 1868 before the 150th commemoration of its signature at Bosque Redondo Memorial at Fort Sumner, N.M.

New Mexico Historic Sites via AP

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On June 6, 2018, Clare “Kitty” Weaver poses next to the first public display of her ancestor’s copy of the Navajo Treaty of 1868 before the 150th commemoration of its signature at Bosque Redondo Memorial at Fort Sumner, N.M.

New Mexico Historic Sites via AP

Clare “Kitty” Weaver, right, and Fort Sumner Historic Site Manager, Aaron Roth prepare the Navajo Treaty of 1868 for display June 6, 2018, for the 150th commemoration of its signature at Bosque Redondo Memorial at Fort Sumner, N.M.

New Mexico Historic Sites via AP

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Clare “Kitty” Weaver, right, and Fort Sumner Historic Site Manager, Aaron Roth prepare the Navajo Treaty of 1868 for display June 6, 2018, for the 150th commemoration of its signature at Bosque Redondo Memorial at Fort Sumner, N.M.

New Mexico Historic Sites via AP

FLAGSTAFF, Ariz. – A 150-year-old document that allowed Navajos to return to their homeland in the Four Corners where Arizona, New Mexico, Utah and Colorado meet is destined for a permanent home at the tribe’s museum.

Navajos had been imprisoned at a desolate tract of land in eastern New Mexico before signing a treaty with the U.S. government in 1868.

There are three known copies of the treaty, one of which had been in a Massachusetts home but was considered lost.

Clare “Kitty” Weaver is the great-grandniece of one of the negotiators who took a copy home. She says it had been mixed in with Samuel F. Tappan’s papers and she only recently discovered its importance.

She reached an agreement last week to donate the treaty to the Navajo Nation. A tribal legislative committee is expected to vote Tuesday on accepting it.