More likely they were a conquered people.
Hey! The PC term for that is, ‘converted at the point of a scimitar’. ;^)
That’s the Great Mosque of Kiva — in 1331, an earthquake struck and led to the collapse and destruction of the mosque. Despite the destruction that it caused, the arched roof remained protected in the east built with Claveaux. On the south-east part of the mosque, there is a large dome that may have served as the mausoleum of Sultan al-Hasan ibn Sulaiman, and it is the only dome that remained standing after the earthquake
In the late eighteenth century, the southern wall of the extension was used to create a new mihrab by knocking through the wall, leading to the roof falling through and being left as ruin.