The oldest part of the castle (actually the farm) of Blier was built around 1500 by the "de Blier" family, who continued to live there until halfway through the 19th century.
The coat of arms of this family of Blier still hangs above the entrance of the castle.
It seems that the famous French actor "Bernard Blier" comes from this family.
Around 1870, Auguste Seny, heir to the de Blier family, built the "Petit Château de Blier.
In 1882, the castle was sold (as a vacation home) to the Wilmart family of Liège.
The first-born son, Charles Wilmart, went to live in the chateau and, having 8 children, built the'Grand Chateau' between 1890 and 1905.
Charles Wilmart was provincial administrator and mayor of Amonines. He died, at the castle, on Sept. 18, 1932.
4 of Charles Wilmart's sons fought in the First World War.
The sons sold Blier's castle in 1935 to Fernand de Ghoÿ, president of the Special Education of Belgium.
The portraits hanging in the billiard room of the Grand Chateau are of Fernand de Ghoÿ and his wife.
During the Battle of the Bulge (World War II, December 1944 - February 1945), the castle became the headquarters of the American troops: it seems that the General Patton stayed in the castle for several days.
In 1960, the castle became the property of a Flemish mutual society (social fund), which used the castle to organize vacations for children.
The farm is sold to a farmer.
In 1997, the Van Dessel family bought the castle to operate it as a vacation home.
In 2023, the Chateau de Blier was purchased by new owners who carried out a series of renovations to continually improve the quality without changing the chateau's charm, style and soul.