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 County, Oklahoma"): Osage County is the largest county by area in the state of Oklahoma in the United States.
Relevant evidence: Yes