The Hrabišici (singular: Hrabišic; German: Hrabischitz) were a North Bohemian aristocratic family, that was also known as the lords of Osek or of Osek and Riesenburg (Czech: z Oseka) but were also named von Riesenburg after their castle, the Riesenburg.
The history of the family goes back to the 11th century.
[1] The family fell on hard times in the 15th century and died out in the early 16th century.