This term is most often mentioned in inscriptions related to the construction of the mosque. For instance, one of the restored inscriptions on the right side wall of the mosque reads: "...Kuragan, created by Sultan, Sultan's son – Ulugbek Kuragan. May Allah make his rule immortal!" So who is Kuragan?
Kuragan is a Mongolian word meaning "son-in-law." It was a title bestowed upon individuals married to women from the lineage of Genghis Khan. During the period of Amir Timur and the Timurids, this title was often added to a person's name. The name mentioned in the restored inscription, "Kuragan Sultan ibn Sultan Ulughbek Kuragan," is evidence of this practice.
It's important to note: research on the inscriptions has established that Kok Gumbaz was built by Mirza Ulughbek in honor of his father, Shahrukh Mirza, the ruler of Khorasan.
You can learn more about the topic in the book-album "Architectural epigraphy of Uzbekistan. Qashqadaryo, Shahrisabz" of the series "Architectural epigraphy of Uzbekistan".
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