The house was built by the workshop of a bricklayer, Marcin Proszko, and master Jan of Kraków in 1476, funded by the chronicler and clergyman Jan Długosz, for the congregation of priests mansioners. The works were managed by Stanisław Łukawski, with the help of Mikołaj Lorincz, who supervised the construction.
In the 16th century, the building was decorated with an attic. In the second half of the next century, the house was rebuilt again during the renovation, necessary due to the damages from the years of the Swedish invasion, and perhaps caused by the explosion of ammunition at the Sandomierz castle.
In the nineteenth century, after the mansioners congregation was dissolved in 1819, the building fell into ruin. Only in the years 1934–1936, on the initiative of Bishop Włodzimierz Jasiński, a thorough renovation of the building for the Diocesan Museum was started.
The house was situated next to the escarpment, in the south-eastern part of the town, near the royal castle and the collegiate church. The building was erected of bricks in a Flemish bond, on a stone foundation, and decorated with irregular rhombuses made of zendrówka bricks. It received two floors and basement on a rectangular plan, covered with a gable roof resting on the shorter sides on triangular gables.
Inside, the ground floor of the building was divided into two parts, separated in the middle by a spacious entry lobby, to which two Gothic portals led. A decorative erection plaque with the coat of arms of Długosz’ Wieniawa, dated 1476, was placed over the southern portal. The entrance lobby was connected to the upper floor and the basement, to which a narrow barrel-vaulted staircase, located in the thickness of the wall, led. The ground floor and the first floor were covered with wooden beam ceilings.
The building houses the Diocesan Museum with collections of sacred art. It has very valuable collections in the field of painting, sacred sculpture, textiles, fine arts and architectural decorations as well as decorative arts, ceramics, furniture collections, numismatics and archeology. Opening hours: summer (from 1 May to 30 September) from Tuesday to Saturday: 9.00 am – 4.30 pm Sundays and public holidays: 13.30 – 16.30. Winter season: (from 1 October to 31 April) from Tuesday to Saturday: 9.00 am – 3.30 pm Sundays and public holidays: 13.30 – 15.30.
Górski E., Diecezjalne Muzeum Sandomierskie, Sandomierz 1946.
Strona webpage zabytek.pl, Dom Długosza, ob. Muzeum Diecezjalne Sandomierz.