Graines castle occupies the summit of a rocky spur which commands Brusson and most of the Val d'Ayas. In medieval times, it communicated through flag or mirror messages with the nearby Bonot Tower and the Villa Castle in Challand-Saint-Victor.
The fief of Graines is documented since 515, when King Sigismund of Burgundy donated it to the newly formed Abbey of St. Maurice. The castle was perhaps built in the 11th century by its monks, who built the Romanesque chapel which is still visible in the interior.
In 1263 the abbey sold the fief to Godefroi of Challant, a faithful vassal of the House of Savoy, whose family held the castle until the 18th century. The castle was a stronghold of Catherine of Challant in her struggle for the family's inheritance. When the Challant disappeared in the 19th century, the castle was bought by Passerin d'Entrèves family, who later sold it to the commune of Brusson. The castle was restored in the early 20th century by Alfredo d'Andrade and Giuseppe Giacosa.
The castle had the typical layout of Aosta Valley early medieval castles. It had an irregular line of walls measuring c. 80 x 50 m, which housed a series of structures such as the large donjon (square tower) and a small chapel, the only ones remaining now.
The donjon is square in plan, with a side of more than 5.5 m. It was the castle's keep and the residence of the castellan or the lord. The entrance was at some five metres from the ground, and could be accessed only by a ladder which could be removed during sieges. A wing was later added to enlarge the tower.
The Romanesque chapel, dedicated to St. Martin, has a single nave with a length of eight metres, ending in a semicircular apse. The ceiling had crumbled down.
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The Jan Hus Memorial stands at one end of Old Town Square. The huge monument depicts victorious Hussite warriors and Protestants who were forced into exile 200 years after Hus, and a young mother who symbolises national rebirth. The monument was so large that the sculptor designed and built his own villa and studio where the work could be carried out. It was unveiled in 1915 to commemorate the 500th anniversary of Jan Hus' martyrdom. The memorial was designed by Ladislav Šaloun and paid for solely by public donations.
Born in 1369, Hus became an influential religious thinker, philosopher, and reformer in Prague. He was a key predecessor to the Protestant movement of the sixteenth century. In his works he criticized religious moral decay of the Catholic Church. Accordingly, the Czech patriot Hus believed that mass should be given in the vernacular, or local language, rather than in Latin. He was inspired by the teachings of John Wycliffe.