The research looks at the diets before the Battle of Mohács. It covers a number of areas. It uncovers new sources, such as previously unknown resolutions, registers, invitation letters and reports of envoys. It also deals with methodological issues, such as the typology of the assemblies - general or partial - and the differences in the range of participants. The current focus is on the Jagiellonian era, whose parliamentary monuments have not yet been fully collected.

The analysis of the narrative sources written in the medieval Kingdom of Hungary has been going on since the establishment of modern historiography. A new impetus was given by the publication of Scriptores rerum Hungaricarum in 1937-1938. Rather than re-examining long-known works, major results in the field are expected to come from the discovery of hitherto unknown narrative sources. My experience so far suggests that such texts have come down to us in early modern copies, typically as part of collections of heterogeneous genres. These volumes - especially in manuscript collections - have rarely been the focus of domestic medieval studies.

Between 1490 and 1526, the conflict between the Kingdom of Hungary and the Ottoman Empire became more acute than ever, especially after the accession of Sultan Selim I (1512). Armistice treaties, regularly renewed under King Wladisaw II, protected the country from the Sultan's campaigns, but fighting in the southern theatre continued with varying degrees of intensity. We still do not have a clear picture of the exact number of the fortresses, their location, their garrisons, or of when and how often they changed hands. The primary sources for all this are royal mandates on the one hand, and registers on the other. It is also essential to be familiar with the relevant research results of Bosnian, Croatian and Serbian historiography, as their source base is often inaccessible to Hungarian researchers.