The Slensanen (also Slenzanen, Czech Silingové, Polish Ślężanie ) were a Slavic tribe.

After the year 500 they settled with other Slavic tribes such as the Golensizen, Opolanen, Dedosizen, Trebowanen and Boboranen the area of the central Silesia after in the wake of the Great Migration Germanic tribes such as the Silinger and other vandals as well as the Lugier were taken off to the west.

The Slensanen lived around the Zoptenberg, which was sacred to them, and the river Lohe.

Written notices

They are called in writing for the first time in the second half of the 9th century in the second part of the Bavarian geographer, under the name Sleenzane as a trunk with 15 (XV ) settlements.

In the boundary description of the diocese of Prague by Emperor Henry IV for the bishopric of Prague from the year 1086 appeared on the trunk as Zlasane.

Political affiliations

From 880 (or earlier) were under the Slensanen the sovereignty of the Great Moravian Empire from 906 then Bohemia.

Between 1000 and 1034 they came under the rule of Bolesław the Brave of Poland.

With the Pentecostal peace of Glatz in 1137 a permanent boundary between Silesia, Bohemia and Moravia was established.

Duchy of Silesia

After the fragmentation of the Polish Kingdom in 1163, the independent duchy of Silesia was. His constitutional connection to Poland was extinguished with the death of the Polish duke Mieszko III Senior. 1202, as the Senioratsprinzip applicable to total Poland since 1138 was abandoned. This gave Silesia next to the dynastic autonomy and political independence. They meant that the later resulting from inheritances principalities of the original Duchy of Silesia and the Duchy of Opole their lands handed over as a fief to the crown of Bohemia from 1289. The political affirmation of these operations took place in 1335 with the Treaty of Trenčín.

As early as the 11th century, the Slensanen have strengthened mixed with the other West Slavic tribes and are then absorbed into the new regional society Silesia.


It is disputed whether the name Silesia is derived from the Germanic tribe of the Silinger or from the Slavic tribe of the Slensanen.