EN
The article describes heterogeneous appositional phrases as attributive possessive expression in the Old Polish, e.g. 'posel pana Szczepanow' (when adjectival modifier accommodates to the constituent member of a compound noun phrase and subordinate noun stands in genitive). The authoress, on the basis of the Great Poland's oaths of the 14th and 15th centuries, shows different types of such syntactic structures and presents the thesis that the dominate role of adjective as the expression of possessive relation caused the heterogeneity of these phrases. The authoress also points at the process of stabilization of appositional phrases we can observe in the Middle Age, the increasing role of possessive nouns and levelling processes in the scope of attributive appositional phrases.