generate questions: The medieval city is a foundation of the Zähringer ruling family, which rose to power in Upper Burgundy in the 12th century. According to 14th century historiography (Cronica de Berno, 1309), Bern was founded in 1191 by Berthold V, Duke of Zähringen.
The medieval city is a foundation of what family? {sep_token} When did the Zahringer ruling family rise to power? {sep_token} Where did the Zahringer ruling family rise to power? {sep_token} What year was Bern founded? {sep_token} Who founded Bern? {sep_token}