During the first half of the 16th century, Sebastian von Weitmühl (Czech: Šebestián z Veitmile) (1490–1549) became lord of Postoloprty and built a castle in the village.
The last owner from the Weithmühl family was Eliška's daughter Veronika, who sold Postoloprty in 1600 to her husband Stephan Georg of Sternberg (Czech: Štěpán Jiří ze Šternberka) (1570–1625) for 42,000 Meissen groschen.
However, Adam Jan died in 1633, and his share passed to his brother, who sold the entire estate to Václav Michna of Vacínov four years later.
[2] The frequent presence of troops during the Seven Years' War from 1756 to 1763 heavily affected the castle, and it even burned down in 1768, but the then owner, the 5th prince Johann I of Schwarzenberg (1742–1789), had it immediately repaired.
His adoptive son (and nephew), prince Henry of Schwarzenberg was taken to various police prisons before being incarcerated in the Buchenwald concentration camp.
[1] After the fall of the communism, the daughter of prince Henry, Elisabeth von Pezold, tried to regain the ownership of Postoloprty Castle.
Due to this and the dilapidation of two other properties owned by Piccinini (the castle of Cítoliby and, until 2013, the baroque farmstead in Kystra), legal proceedings started in 2018.
In October 2021, the town of Postoloprty bought the castle for 13.2 million CZK with the aim of repairing it for cultural events, apartments for the elderly and clerks' offices.
In 1680, during the renovations by Georg Ludwig von Sinzendorf, a square tower designed by Jiří Pach of Wiesenthal was added.
According to a description from 1739, when a storm tore off its roof, the tower had three floors, a clock with dials on all four sides, and a gateway at the ground level that led into the courtyard.
[2] A more economical design by Andreas Zach was executed and this is what we see to day: a pavilion at the end of the wing and in the middle a neoclassical gate.
On the courtyard side of the central wing, there are pillar arcades on the ground floor, and pavilion extensions emphasize the corners.