The Yscani Indians, a Wichita group from the area of north central Texas, were met by Jean Baptiste Bénard de la Harpe on the lower Canadian River in the area of future Oklahoma in 1719.
Fray José Francisco Calahorra y Saenz visited them in the area of North Texas in 1760 and made an unsuccessful attempt to establish a mission for them.
In 1772 Athanase de Mézières visited the Yscanis on the east bank of the Trinity River below the site of present Palestine Texas.
Juan Agustín Morfí in 1781 heard that they were living in a large village eight leagues up the Brazos River from the Tawakoni Indian settlement near the site of present Waco Texas.
The name was not used after
1794, and the Waco Indians may have been the Yscanis under a new name. 
Webb Hodge, ed., Handbook of American Indians North of Mexico (2
vols., Washington: GPO, 1907, 1910; rpt., New York: Pageant, 1959).