Seyyid Kasim Gubari of Diyarbakr is recorded as being responsible for much of the calligraphy of the Sultan Ahmed Mosque (the "Blue Mosque") in Istanbul, he was commissioned to write verses from the Quran throughout the mosque. He was also said to be one of the greatest calligraphers of his day.

Based on that paragraph can we conclude that this sentence is true?
Seyyid Kasim Gubari of Diyarbakr is famous all throughout Turkey.
It's impossible to say