The Lithuanian nobility was historically a legally privileged class in the Grand Duchy of Lithuania consisting of Lithuanians, from the historical regions of Lithuania Proper and Samogitia, and, following Lithuania's eastern expansion, many Ruthenian noble families (boyars). Families were primarily granted privileges for their military service to the Grand Duchy. The Polish-Lithuanian Commonwealth had one of the largest percentages of nobility in Europe, close to 10% of the population, in some regions, like Samogitia, it was closer to 12%.