In 2004, KONS has declared the abbey Church of the Dormition of the Blessed Virgin Mary a National monument of Bosnia and Herzegovina.

[2] The building of the complex of the Mariastern Abbey in Banja Luka is associated with the arrival of the trappist Franz Pfanner in Bosnia.

[3][4] After 23 months of unsuccessful attempts to set up a Trappist monastery in Hungary, Croatia and Lower Styria, and on learning that a law had been passed in the Ottoman Empire allowing the Christians to buy land, Pfanner came to Banja Luka, where on 10 June 1869 he bought 100 acres of land in Delibašino Selo near Banja Luka for the sum of 1.400 ducats.

Inside the shed were two wooden barrels in which the Trappists kept their books, breviary, ink and paper.

During the construction of the temporary monastery, Pfanner faced a number of problems with regard to the registration of the land he had purchased.

On 7 March 1870 Holy See confirmed the new establishment and the Apostolic vicar, Paškal Vujičić gave his consent.

In late 1869, before Christmas, Pfanner travelled to Rome to obtain permission to build a new monastery.

Two days later a rescript arrived from Rome for the establishment of a monastery, with a clause from Propaganda requiring the Trappists to build an orphanage as soon as possible.

The estate in Delibašino selo gradually crossed the Vrbas and extended to the left bank of the river.

In the first years of the Austro-Hungarian rule in Bosnia and Herzegovina, the monastery played an important role in settling the foreigners in area around the monastery, with father Franz Pfanner as the main person agitating for German colonization in the Vrbas valley.

After Pfanner's departure for Mariannhill, on 25 August 1883 the General Chapter appointed Bonaventure Bayer titular Prior of the monastery.

His recommendation was that the Mariastern monastery be designated as an abbey, which gained the backing of the members of the Chapter of the Trappist Order who forwarded this proposal to Rome.

The bell tower was erected in 1896, another wing of the monastery was added in 1897 with the assistance of donations from Germany, Austria, Hungary, the Netherlands and Switzerland.

In the brewery, textile factory and mill, the power was increased by a steam engine, but because it was insufficient, a 60-horsepower turbine was built in 1899 on the Vrbas River.

In addition, a timber dam was built across the Vrbas to provide the necessary water fall to operate the turbine.

He completed his higher education in Rome, and was engaged in philosophy, metaphysics, biology, theology, mathematics and physics.

During Abbot Diamant's time, after 1924, as a result of the fierce competition that followed World War I, the power plant, textile factory and brewery were handed over to a joint stock company, Industrial Community.

The major earthquake of 27 October 1969 destroyed the monastery buildings (completely) and the church (partially).