At the Southwest tip of the Inchmurrin island are the ruins of the 14th century castle built by Duncan the Eighth Earl of Lennox. The castle is recorded as having been completed by 1393 and the Earls of Lennox took up residence in the 14th century when they moved from their castle in Balloch during the plague. The castle was composed of three rooms, outbuildings and a courtyard.
King Robert the I is believed to have been given refuge here by the Fifth Earl of Lennox after his defeat by the MacDougalls of Lorne. King Robert the I also established a deer park here in the 14th century.
Isabella, countess of Albany and the daughter of the Eighth earl of Lennox was exiled here after 1425 when her husband, father and two sons were all executed on the same day at Stirling by King James I. She lived at the castle for the rest of her life and died on the island in 1460 after which the castle was abandoned. It is recorded that Sir John Colquhoun of Luss was killed here in 1439 during a raid led by Lachlan MacLean.
King James the IV used the castle as a hunting lodge around 1506 as did King James the VI in later years.
The Château de Foix dominates the town of Foix. An important tourist site, it is known as a centre of the Cathars. Built on an older 7th-century fortification, the castle is known from 987. In 1002, it was mentioned in the will of Roger I, Count of Carcassonne, who bequeathed the fortress to his youngest child, Bernard. In effect, the family ruling over the region were installed here which allowed them to control access to the upper Ariège valley and to keep surveillance from this strategic point over the lower land, protected behind impregnable walls.
In 1034, the castle became capital of the County of Foix and played a decisive role in medieval military history. During the two following centuries, the castle was home to Counts with shining personalities who became the soul of the Occitan resistance during the crusade against the Albigensians. The county became a privileged refuge for persecuted Cathars.
The castle, often besieged (notably by Simon de Montfort in 1211 and 1212), resisted assault and was only taken once, in 1486, thanks to treachery during the war between two branches of the Foix family.
From the 14th century, the Counts of Foix spent less and less time in the uncomfortable castle, preferring the Governors' Palace. From 1479, the Counts of Foix became Kings of Navarre and the last of them, made Henri IV of France, annexed his Pyrrenean lands to France.
As seat of the Governor of the Foix region from the 15th century, the castle continued to ensure the defence of the area, notably during the Wars of Religion. Alone of all the castles in the region, it was exempted from the destruction orders of Richelieu (1632-1638).
Until the Revolution, the fortress remained a garrison. Its life was brightened with grand receptions for its governors, including the Count of Tréville, captain of musketeers under Louis XIII and Marshal Philippe Henri de Ségur, one of Louis XVI's ministers. The Round Tower, built in the 15th century, is the most recent, the two square towers having been built before the 11th century. They served as a political and civil prison for four centuries until 1862.
Since 1930, the castle has housed the collections of the Ariège départemental museum. Sections on prehistory, Gallo-Roman and mediaeval archaeology tell the history of Ariège from ancient times. Currently, the museum is rearranging exhibits to concentrate on the history of the castle site so as to recreate the life of Foix at the time of the Counts.