THE term 'Ruthenian Law' (Jus Ruthenicum or Jus Ruthenicale)l relates to the system of laws and customs prevailing among the 'Ruthenian' (Rus')2 population of Galicia at the time of her seizure by the Polish king Casimir the Great in 1349. In 1387 Galicia was formally incorporated into the Kingdom of Poland, but the 'Ruthenian' people were allowed, for some time, to keep their old customs intact. It was only in 1430 that the Ruthenian Law was abrogated in principle. In 1435 the Polish system of administration and courts was introduced in the country, court proceedings being now recorded in Latin instead of in Old Russian. Even after that, however, and until at least the early sixteenth century, the legal status of certain groups of the population remained the same as it had been in the time of the Ruthenian Law (tempore juris Ruthenicalis). It must be said in this connection that, owing to the devastation of Galicia by the Mongols in the thirteenth century and to a series of raids by Lithuanians, Poles, and Hungarians, plus local riots and uprisings, in the late thirteenth and the first half of the fourteenth century, most of the local archives perished and no documents of the 'Ruthenian' courts of the pre-Polish period have been preserved. As a result it is only for the period after 1435 that the documentary evidence for the study of social history of mediaeval Galicia becomes available. Paradoxically enough, then, most of what we know of some of the institutions of the Ruthenian Law, we know through the sources of a later period when the Ruthenian Law was officially abrogated. Generally speaking, the Polish kings of the fourteenth and fifteenth centuries considered Galicia a valuable asset not only because of the natural resources of the country (fertile land, salt mines, crossing of several trade routes), but even more so because of the stronger position of the king in regard to the nobility in this newly acquired land, so much more that its acquisition was the result of the personal initiative of a king (Casimir the Great). It was but natural that the king tried to put as many social groups in the country as possible under his direct control. This explains the fact that the king lost no time in confirming his authority over the social groups which had been already in a subordinated position in regard to the former rulers of the country-the Mongols and the local Rus' princesprior to 1349. The status of these groups was not changed after 1435. Three such groups are mentioned in the records of the Galician courts of the fifteenth century: (1) The 'Hundred Men' (Homines Sbtny, that is, men belonging to the 'Hundred'); (2) The 'Horde Men' (Ordyntsy); and (3) The Homines Ka-