Which medieval Turkic literary language became an ancestor of modern Turkish?

The medieval Turkic literary language that served as the ancestor of modern Turkish is Ottoman Turkish (and its predecessor, Old Anatolian Turkish).12

Old Anatolian Turkish emerged in Anatolia beginning in the 13th century, following the arrival of the Seljuq Turks. Over time, this language evolved into Ottoman Turkish, which incorporated significant Arabic and Persian vocabulary and grammatical influences. Following the establishment of the Turkish republic in 1923, language reforms were implemented to remove many foreign elements, leading to the emergence of modern Turkish as a distinct literary language.12