Question: The largest county in Oklahoma by area, gets its name from the broad rolling hills and rolling tallgrass prairie and Cross Timbers encompassing the county and surrounding areas, including portions of Mayes, Tulsa, Washington and Kay Counties, was created in what year?
Sentence (from "Osage Hills"): The Osage Hills is a hilly area in Oklahoma, commonly known as "The Osage".
Relevant evidence: Yes