Like many other Albanian-origin settlements the urban structure was based on the gijtonia, in other words, circular streets. Either in 1459 or early in the 16th century, another group of Albanian political refugees came and settled in Mongrassano.
This passage describes how Albanian-origin communities often had a similar urban layout with circular streets called "gijtonia."  A second wave of Albanian refugees arrived in Mongrassano during the 15th or early 16th centuries.