The Orkhon inscriptions , also known as Orhon Inscriptions, Orhun Inscriptions, and the Khöshöö Tsaidam monuments (, also spelled Khoshoo Tsaidam, Koshu-Tsaidam) are two memorial installations erected by the Göktürks written in Old Turkic alphabet in the early 8th century in the Orkhon Valley in Mongolia. They were erected in honor of two Turkic princes, Kul Tigin and his brother Bilge Khagan.