Frederick Ulrich (German Friedrich Ulrich 5 April 1591 – 11 August 1634) Duke of Brunswick-Lüneburg was prince of Wolfenbüttel from 1613 until his death.Frederick Ulrich was a son of Henry Julius Duke of Brunswick-Lüneburg. He studied at the universities of Helmstedt and Tübingen and became ruling duke after the death of his father in 1613.