Stela 11 records the latest date found at Tikal -- it was dedicated in AD 869. However, the ruler who performed this dedication remains unknown, for the glyphs comprising his name are too badly eroded to be read.
"Maudslay's 1882 photograph of Stela 10 shows also the upper half of Stela 11 lying face-down on the ground to the right. The base of the stela had remained in place when it broke, and the whole has been re-erected at that spot in the center of the second row of monuments on the Great Plaza.
Genevieve Michel, The Rulers of Tikal: A Historical Reconstruction & Field Guide to the Stelae, p. 135