The art collection of István Marczibányi (1752–1810), remembered as the benefactor of the Hungarian nation, who devoted a great part of his fortune to religious, educational, scientific and social goals, is generally known as a collection of ‘national Antiquities’ of Hungary. This opinion was already widespread in Hungarian publicity at the beginning of the 19th century, when Marczibányi pledged that he would enrich the collection of the prospective Hungarian national Museum with his artworks. But the description of his collection in Pál Wallaszky’s book Conspectus reipublicae litterariae in Hungaria published in 1808 testifies to the diversity and international character of the collection. In the Marczibányi “treasury”, divided into fourteen units, in addition to a rich cabinet for coins and medals there were mosaics, sculptures, drinking vessels, filigree-adorned goldsmiths’ works, weapons, Chinese art objects, gemstones and objects carved from them (buttons, cameos, caskets and vases), diverse marble monuments and copper engravings. Picking, for example, the set of sculptures, we find ancient Egyptian, Greek and Ro man pieces as well as mediaeval and modern masterpieces arranged by materials.After the collector’s death, his younger brother Imre Marczibányi (1755–1826) and his nephews Márton (1784–1834), János (1786–1830), and Antal (1793–1872) jointly inherited the collection housed in a palace in dísz tér (Parade Square) in Buda. In 1811, acting on the promise of the deceased, the family donated a selection of artworks to the national Museum: 276 cut gems, 9 Roman and Byzantine imperial gold coins, 35 silver coins and more than fifty antiquities and rarities including 17th and 18th-century goldsmiths’ works, Chinese soap-stone statuettes, ivory carvings, weapons and a South Italian red-figure vase, too. However, this donation did not remain intact as one entity. With the emergence of various specialized museums in the last third of the 19th century, a lot of artworks had been transferred to the new institutions, where the original provenance fell mostly into oblivion.In the research more than a third of the artworks now in the Hungarian national Museum, the Museum of Applied Arts and the Museum of Fine Arts, Budapest could be identified, relying on the first printed catalogue of the Hungarian national Museum (1825) titled Cimeliotheca Musei Nationalis Hungarici, and the handwritten acquisition registers. The entries have revealed that fictitious provenances were attached to several items, since the alleged or real association with prominent historical figures played an important role in the acquisition strategies of private collectors and museums alike at the time. For example, an ivory carving interpreted in the Cimeliotheca as the reliquary of St Margaret of Hungary could be identified with an object in the Metalwork Collection of the Museum of Applied Arts (inv. no. 18843), whose stylistic analogies and parallels invalidate the legendary origin: the bone plates subsequently assembled as a front of a casket were presumably made in a Venetian workshop at the end of the 14th century.There are merely sporadic data about the network of István Marczibányi’s connections as a collector, and about the history of his former collection remaining in the possession of his heirs. It is known that collector Miklós Jankovich (1772–1846) purchased painted and carved marble portraits around 1816 from the Marczi bányi collection, together with goldsmiths’ works including a coconut cup newly identified in the Metalwork Collection of the Museum of Applied Arts (inv. no. 19041). The group of exquisite Italian Cinquecento bronze statuettes published by art historian Géza Entz (1913–1993), was last owned as a whole by Antal Marczibányi (nephew of István) who died in 1872. These collection of small bronzes could have also been collected by István Marczibányi, then it got scattered through inheritance, and certain pieces of it landed in north American and European museums as of the second third of the 20th century. Although according to Entz’s hypothesis the small bronzes were purchased by István’s brother Imre through the mediation of sculptor and art collector István Ferenczy (1792–1956) studying in Rome, there is no written data to verify it. By contrast, it is known that the posthumous estate of István Marczibányi included a large but not detailed collection of classical Roman statues in 1811, which the heirs did not donate to the national Museum. It may be presumed that some of the renaissance small bronzes of mythological themes following classical prototypes were believed to be classical antiquities at the beginning of the 19th century. Further research will hopefully reveal more information about the circumstances of their acquisition.