Periodic study of pronouns in the Uzbek language, comparing their forms in ancient written monuments with their modern forms, is one of the main goals of our topic. In the article, the phonetic, semantic, lexical meanings, number and agreement categories of the reflexive pronoun and its forms and characteristics in ancient Turkic language monuments, its function in the sentence were studied, compared and analyzed through examples. Changes in the historical development of each language primarily affect its lexicon and vocabulary. We focus on pronouns because despite constituting only a tiny fraction of the available words in the English language, they are among the most frequently used (Pennebaker, 2011). Furthermore, extensive research has established that pronouns play a fundamental role in people’s everyday experiences.