One of Ireland's most sacred sites is where St Patrick, patron saint of Ireland, set up his first church. On Cathedral Hill sits a magnificent church renovated from its medieval origins in the 18th century. the team look for the early monastic buildings where according to legend St. Patrick built a monastery and was buried. They are also digging up medieval finds, including roof tiles and glass, which indicate a high-status building. They soon identify the large double ditch which originally enclosed the monastery complex.