Otto the Mild, Duke of Brunswick-Lüneburg

Otto the Mild (1292–1344), Duke of Brunswick-Lüneburg, was the eldest son of Albert II and Rixa of Werle. He succeeded his father in 1318. In 1311 he married Jutta of Hesse, and in 1319, after her death, Agnes of Brandenburg, through whom he claimed the Altmark.

Unable to master the Brandenburg nobility, he sold his rights there for 3000 marks in 1343. He died at Göttingen in 1344; his brothers Ernest and Magnus split the duchy into Göttingen and Wolfenbüttel.