The Russian nobility (дворя́нство) arose in the Middle Ages. In 1914 it consisted of approximately 1,900,000 members (about 1.1% of the population) in the Russian Empire. Up until the February Revolution of 1917, the noble estates staffed most of the Russian government and possessed a Gentry assembly. The Russian word for nobility, dvorianstvo (), derives from Slavonic dvor (двор), meaning the court of a prince or duke (kniaz), and later, of the tsar or emperor. Here, dvor originally referred to servants at the estate of an aristocrat. In the late 16th and early 17th centuries, the system of hierarchy was a system of seniority known as mestnichestvo. The word dvoriane described the highest rank of gentry, who performed duties at the royal court, lived in it (Moskovskie zhiltsy), or were candidates to it, as for many boyar scions (dvorovie deti boiarskie, vybornye deti boiarskie). A nobleman is called a dvorіanin (plural: dvorіane). Pre-Soviet Russia shared with other countries the concept that nobility connotes a status or social category rather than a title. Throughout the 18th and 19th centuries, the title of the nobleman in Russia gradually became a formal status, rather than a reference to a member of the aristocracy, due to a massive influx of commoners via the Table of ranks. Many descendants of the former ancient Russian aristocracy, including royalty, saw their formal standing change to merchants, burghers, or even peasants, while people descended from serfs (like Vladimir Lenin's father) or clergy (like in the ancestry of actress Lyubov Orlova) gained formal nobility. The nobility arose in the 12th and 13th centuries as the lowest part of the feudal military class, which comprised the court of a prince or an important boyar. From the 14th century land ownership by nobles increased, and by the 17th century, the bulk of feudal lords and the majority of landowners were nobles. The nobles were granted estates out of State lands in return for their service to the Tsar, either for as long as they performed service or for their lifetime.