would also share their crest with families adopted into the clan. Sometimes unrelated families would be falsely attributed to a clan on the basis of similarity of crests. Some noble families inaccurately claimed clan membership. The number of coats of arms in this system was comparatively low and did not exceed 200 in the late Middle Ages. There were 40,000 in the late 18th century. At the Union of Horodło, forty-seven families of Catholic Lithuanian lords and boyars were adopted by Polish szlachta families and allowed to use Polish coats of arms. Heritability The tradition of differentiating between a coat of arms and a lozenge granted to women, did not develop in Poland. By the 17th century, invariably, men and women inherited a coat of arms from their father. When mixed marriages developed after the partitions, that is between commoners and members of the nobility, as a courtesy, children could claim a coat of arms from their distaff side, but this was only tolerated and could not be passed on to the next generation. The brisure was rarely used. All children would inherit the coat of arms and title of their father. This partly accounts for the relatively large proportion of Polish families who had claim to a coat of arms by the 18th century. Another factor was the arrival of titled foreign settlers, especially from the German lands and the Habsburg Empire. Illegitimate children could adopt the mother's surname and title by the consent of the mother's father, but would sometimes be adopted and raised by the natural father's family, thereby acquiring the father's surname, though not the title or arms. Ennoblement Kingdom of Poland The number of lawfully granted ennoblements (naturalization) after the 15th century was minimal. In the Kingdom of Poland and later in the Polish–Lithuanian Commonwealth, ennoblement (nobilitacja) may be equated with an individual given legal status as a szlachcic member of the Polish nobility. Initially, this privilege could be granted by the monarch, but from 1641 onward, this right was reserved for the sejm. Most often the individual being ennobled would join an existing noble szlachta clan and assume the undifferentiated coat of arms of that clan. According to heraldic sources, the total number of lawful ennoblements issued between the 14th century and the mid-18th century is estimated at 800. This is an average of only about two ennoblements per year, or only 0.000,000,14 –