There are extensive low earthworks on the hillside .
The earliest buildings are St Molaise 's House ( a very small church ) and the fine round tower close by , both with accomplished Romanesque decoration of the 12th century .
There are extensive low earthworks on the hillside , but the earliest buildings are St Molaise 's House ( a very small church ) and the fine round tower close by , both with accomplished Romanesque decoration of the 12th century .