Druzhina, drużyna, or družyna (Slovak and Czech: družina; Polish: drużyna; Russian and Ukrainian: дружи́на, druzhýna literally a "fellowship") in the medieval history of Kievan Rus' and Poland was a retinue in service of a Slavic chieftain, also called knyaz. The name is derived from the Slavic word drug (друг) with the meaning of "companion, friend". The English equivalent is retinue.
In early Rus a druzhina helped the prince administer his principality and constituted the area's military force. The first members of a druzhina in Rus Khaganate were the Varangians, whose princes established control there in the 9th century. Soon members of the local Slavic aristocracy as well as adventurers of a variety of other nationalities became druzhinniki. The druzhina organization varied with time and survived in one form or another until the 16th century.
The druzhina was composed of two groups: the senior members, later known as boyars, and the junior members, later known as boyar scions. The boyars were the prince's closest advisers who also performed higher state functions. The junior members constituted the prince's personal bodyguard and were common soldiers. Members were dependent upon their prince for financial support, but they served the prince freely and had the right to leave him and join the druzhina of another prince. As a result, a prince was inclined to seek the goodwill of his druzhina by paying the druzhinniki wages, sharing his war booty and taxes with them, and eventually rewarding the boyars with landed estates, complete with rights to tax and administer justice to the local population.
Archeological findings at cemeteries in the vicinity of the gord of Ostrów Lednicki, near Poznań, has proven the presence of Norsemen in the area around 10th century, suggesting that they played an important part in the drużyna of Mieszko I, the de facto founder of the Polish state. Mieszko would later marry his daughter Świętosława (Sigrid) to the Danish king Sweyn Forkbeard. Mieszko's daughter would later give birth to Cnut the Great, king of Denmark, Sweden, and Norway – as well as a conqueror of England. It is likely that the Polish-Norse relationship was a result of earlier trade and cooperation.
Unlike his predecessors, Casimir I the Restorer promoted landed gentry over the drużyna as his base of power.
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- "Ibrāhīm ibn Ya‛qūb al-Isrā’īlī al-Ṭurṭūshī," by Lutz Richter-Bernburg, in: The Oxford Companion to World Exploration, David Buisseret, editor-in-chief, 2 vols., Oxford UP 2007, I:402b-403b