The ruined buildings on the top of the Hill of Slane are remains of a 1512 reconstruction of the old monastry which the Fleming family re-built for the Franciscans.
The church has a fine west tower, about 19m high, with an earlier gothic-style window.
The collage, a separate building forming a quadrangle, housed four priests, four lay brothers and four choristers.
Look for a number of carved heads and gargoyles.
The Fleming arms are on the west wall of the quadrangle, and over the entrance in the southwest wall are the arms of England and France, referred to above.
The friary was dissolved only 30 years later as the Reformation took effect in Ireland.
In 1631 the Flemings tried again to restore it, but in less than 20 years the newly-installed Capuchin monks were driven out by Cromwell.
It was finally abandoned as a place of worship in 1723.