His father was Lawrence (I), an illustrious military general and baron during the reign of Béla IV of Hungary,[1] who held various government positions during his career.
[3] Both Kemény and Nicholas embroiled in conflict with the Óvári family from the gens (clan) Győr, which also possessed large portions in Baranya County.
Among the surrounding villages, of which the lordship of Harsány was composed, were Ug, Permány, Tótvölgy, Perecske, Boja, Hídvég and the St. Michael monastery.
Upon the request of his mother Elizabeth the Cuman and wife Isabella of Sicily, Ladislaus expanded the range of donated villages for Kemény.
[8] In early 1291, Kemény fought in that auxiliary troops at his own expense, which was sent to Poland in order to assist Władysław the Elbow-high, Duke of Kraków and Sandomierz in his unification war against Wenceslaus II of Bohemia.
Because of his military service, Andrew III confirmed the aforementioned donation letters of Ladislaus IV in August 1291 and October 1291, regarding Szársomlyó Castle and Harsány lordship.
However, Nicholas even in 1300 usurped Kopács, because Kemény, who was responsible for enforcing the provision as the ispán of Baranya County, successfully sabotaged the decision, in accordance with a royal instruction to his successor John Csák.
In retaliation for the official complaint of Conrad Győr, Kemény and Philip Kórógyi destroyed his several additional landholdings in the area, for instance Gréc and Csér.
[10] Following a lost litigation against their relative, Stephanie Budmér (also Conrad Győr's granddaughter), Kemény's impoverished widow mortgaged, then sold Fejértó around October 1303 to their familiaris Ladislaus Hencsei, in order to raise her orphaned two sons and to get marry their two daughters.