 Complete the following phrase:  Although Mozarabic communities maintained for the practice of their religious rites some of the Visigothic churches predating the Islamic occupation, the extent of this Visigothic artistical heritage is hard to pinpoint, as most monuments from the previous period have been lost. Nevertheless, those buildings that did survive seem to hold on tenaciously to traditions of Visigothic architecture with few, if any, Islamic features. All this includes them in the ample concept of Pre-Romanesque architecture. Besides this possible Visigothic connection, Mozarabic architecture in Portugal also came in contact with 