The first part of the town's name derives from the Latin word "Runcie" (weed), while the second part derives from the Legionnaires of D'Annunzio, who gathered here before leaving for the conquest of Fiume in Istria in 1919. Municipality in the province of Gorizia, between the Adriatic Sea and the slopes of the Carso, it is located so near Monfalcone to form one large urban center. Seat of the major airport of the Friuli region.
The discovery of a necropolis in the area testifies to the presence of a settlement since pre-Roman times. The Romans arrived in the II century B.C. and settled here. Due to the particularly strategic location, near an important crossroads, over the centuries it was subject to attacks by the Hungarians and the Turks. The first documentation of the historical presence of a settlement dates to 967, year in which the Emperor Otto I granted a substantial part of territory, including Ronchi to the Patriarchate of Aquileia. The domain of the Patriarchs ended in the XV century and in later years, it was subjected to the jurisdiction of the Serenissima Republic of Venice, that declared war to Austria. In 1615, during the clashes, the town was put to fire. After the advent of Napoleon, and the subsequent Austrian domain, the territories were incorporated into those of the Italian State.

Not to miss:
- the Church of Santo Stefano in Vermegliano, which was rebuilt in the middle of the XVI century. The interior is decorated by XVI century frescoes of the artist Secante and artworks of the XV century;
- the Church of the Holy Trinity, built in 1762, in Baroque style, houses a very rich marble altar;
- the Church of Saints Lorenzo and Domenica of medieval origin, it was completely rebuilt after the First World War;
- the remains of a Roman villa dating from the I-II century A.D., discovered recently near the airport. It features well-preserved fine mosaics.