The author deals with Abraham Rufus, one of the biggest landowners in the area of present southwestern Slovakia. He observes his fast career promotion, military merit and loyal services to the Hungarian king Andrew III. during his fights against both domestic and foreign enemies of the Hungarian kingdom in the end of the 13th century. He also observes the relationship of Abraham Rufus to Matthew Czak. In his services Rufus presents himself as a loyal familiar. The author searches the property domain of Abraham Rufus, tries to reconstruct his relatives and mentions the ranks he achieved during the reign of Andrew III. The atention is focused on the relationship between the king Charles Robert and Abraham Rufus. In the conclusion of his study the author observes the division of Abraham Rufus´s property among his four sons as well as the way they dealt with the property they were left.