Landsberg was the capital of a small margraviate of this name, ruled in the 12th century by a certain Dietrich, who built the town.
Detmold possesses a natural history museum theatre, high school, library, the house in which the poet Ferdinand Freiligrath (1810-1876) was born, and that in which the dramatist Christian Dietrich Grabbe (1801-1836), also a native, died.
The Danish captain Jens Arnold Dietrich Jensen reached, in 1878, the Jensen Nunataks (5400 ft.
Otto appointed his younger son Dietrich as his successor and was attacked and taken prisoner by his elder son Albert; but, after obtaining his release by order of the emperor Frederick I., he had only just renewed the war when he died in 1190.
Otto was succeeded by his son Albert, called the Proud, who was engaged in warfare with his brother Dietrich until his death in 1195.