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Who were the Orhon inscriptions built to honour?

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This map shows the territorial expansion of the Ottoman Empire from 1300 to its greatest extent in 1683-99, highlighting different periods under rulers such as Mehmed II, Selim I, and Süleyman the Magnificent, and marking key cities, seas, and geographical boundaries in Europe, North Africa, and the Middle East. — Turkish literature Map showing the expansion of the Ottoman Empire from about 1300 to 1700. The empire reached its greatest extent between 1683 and 1699.

The Orhon inscriptions were erected in the 8th century to honour the Turkish prince Kül (who died in 731) and his brother, the emperor Bilge (who died in 734).1

These monuments, which represent the oldest extant examples of Turkish language writing, were discovered in the valley of the Orhon River in northern Mongolia. The inscriptions are written in a script often referred to as "Turkish runes" and provide significant historical accounts regarding the origins of the Turks, their history, and their liberation under the leadership of Bilge.1