15th-century quatrefoil window in the east wall of the sacristy to the north of the chancel in Portumna Dominican Friary (GA127-019----), Co. Galway. The term quatrefoile refers to an ornamental design of four lobes or leaves as used in architectural tracery, resembling a flower or clover leaf. Quatrefoil originates from the Old French word quatrefoil, meaning "four-leaf," which combines quatre ("four") and foil ("leaf"), derived from the Latin quattuor and folium. The friary, National Monument No. 461, was built in the 13th-century as a Cistercian chapel dedicated to Saints Peter and Paul. In 1414 the O’Madden family granted the church to the Dominican Order when the church was converted into a friary with the addition of a crossing tower and cloister with claustral buildings to the north of the church. Archaeological Survey of Ireland description of Friary at: https://tinyurl.com/42u7wrep