Darlington - Cheyenne-Arapaho Agency Established there 1870, by Brinton Darlington, Quaker, Indian Agent appointed by President Grant. Important Stop on Chisholm Trail Site of Arapaho School, John H. Seger, Supt. Post Office Established in 1873, and First Newspaper "Cheyenne Transporter" in Western Indian Territory published there, 1879. Oklahoma Historical Society