Answer
Ottokar II's mother, Constance, belonged to the illustrious Hohenstaufen dynasty. This prominent imperial family originated from Swabia, Germany, and held a significant position in the Holy Roman Empire during the 12th and 13th centuries. Notably, Constance was the daughter of King Philip of Swabia and granddaughter of Emperor Frederick Barbarossa, further strengthening Ottokar's connection to the prestigious Hohenstaufen lineage.