VERNON, Texas (AP) A billionaire NFL owner has purchased a Texas mega-ranch that has been operated by one family for nearly a century.

The heirs of cattle baron W.T. Waggoner said Tuesday that a judge permitted the sale to Rams owner Stan Kroenke for an undisclosed sum. The ranch had been listed for $725 million when it hit the market in August 2014.

The Waggoner Ranch is about 175 miles northwest of Dallas. It's the largest behind one fence in the United States.

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Kroenke said in a statement that he would ''protect and preserve'' what broker Bernie Uechtritz called the ''Statue of Liberty'' of cowboy culture.

Waggoner granddaughter Electra Waggoner Biggs filed a lawsuit in 1991 to liquidate the estate, setting off a decadeslong courtroom battle among the heirs.