 The Chapel of Saints Cosme and Damian ( Spanish : Capilla de San Cosme y San <unk> ) was built because these two saints were commonly invoked during a time when New Spain suffered from the many diseases brought by the <unk> . The main altarpiece is Baroque , probably built in the 17th century . Oil paintings on wood contain scenes from physician saints , and are attributed to painter Sebastian Lopez <unk> , during the second half of the 17th century . The chapel contains one small altarpiece which came from the Franciscan church in <unk> , to the west of Mexico City , and is dedicated to the birth of Jesus . 
