question: Who is Otto Iii, Prince Of Anhalt-Bernburg's paternal grandfather?
context: [["Bernhard VI, Prince of Anhalt-Bernburg", ["Bernhard VI, Prince of Anhalt- Bernburg( died 2 February 1468) was a German prince of the House of Ascania and ruler of the Principality of Anhalt- Bernburg.", "He was the eldest son of Otto III, Prince of Anhalt- Bernburg, by his first unknown wife."]], ["John I, Prince of Anhalt-Bernburg", ["John I, Prince of Anhalt- Bernburg( died 5 June 1291) was a German prince of the House of Ascania and ruler of the principality of Anhalt- Bernburg.", "He was the eldest son of Bernhard I, Prince of Anhalt- Bernburg, by his wife Princess Sophie, daughter of King Abel of Denmark."]], ["Otto IV, Prince of Anhalt-Bernburg", ["Otto IV, Prince of Anhalt- Bernburg( died 1 May 1415) was a German prince of the House of Ascania and ruler of the principality of Anhalt- Bernburg.", "He was the youngest son of Otto III, Prince of Anhalt- Bernburg, by his unknown first wife."]], ["Bernhard III, Prince of Anhalt-Bernburg", ["Bernhard III, Prince of Anhalt-Bernburg (died 20 August 1348) was a German prince of the House of Ascania and ruler of the principality of Anhalt-Bernburg.", "He was the eldest son of Bernhard II, Prince of Anhalt-Bernburg, by his wife Helene, daughter of Wizlaw II, Prince of R\u00fcgen."]], ["Henry IV, Prince of Anhalt-Bernburg", ["Henry IV, Prince of Anhalt- Bernburg( died 7 July 1374) was a German prince of the House of Ascania and ruler of the principality of Anhalt- Bernburg.", "He was the second son of Bernhard III, Prince of Anhalt- Bernburg, by his first wife Agnes, daughter of Rudolf I, Duke of Saxe- Wittenberg."]], ["Alexius Frederick Christian, Duke of Anhalt-Bernburg", ["Alexius Frederick Christian of Anhalt- Bernburg( 12 June 1767 \u2013 24 March 1834), was a German prince of the House of Ascania.", "From 1796 until 1807 he was Reigning prince of the principality of Anhalt- Bernburg, and from 1807 until 1834 the first Duke of the Duchy of Anhalt- Bernburg."]], ["Bernhard IV, Prince of Anhalt-Bernburg", ["Bernhard IV, Prince of Anhalt- Bernburg( died 28 June 1354) was a German prince of the House of Ascania and ruler of the principality of Anhalt- Bernburg.", "He was the eldest son of Bernhard III, Prince of Anhalt- Bernburg, by his first wife Agnes, daughter of Rudolf I, Duke of Saxe- Wittenberg and Elector of Saxony."]], ["Bernhard II, Prince of Anhalt-Bernburg", ["Bernhard II, Prince of Anhalt- Bernburg( ca. 1260 \u2013 aft. 26 December 1323), was a German prince of the House of Ascania and ruler of the principality of Anhalt- Bernburg.", "He was the third son of Bernhard I, Prince of Anhalt- Bernburg, by his wife Princess Sophie, daughter of King Abel of Denmark."]], ["Otto III, Prince of Anhalt-Bernburg", ["Otto III, Prince of Anhalt-Bernburg (died 27 February 1404) was a German prince of the House of Ascania and ruler of the principality of Anhalt-Bernburg.", "He was the youngest son of Bernhard III, Prince of Anhalt-Bernburg, by his third wife Matilda, daughter of Magnus I, Duke of Brunswick-G\u00f6ttingen."]], ["Bernhard V, Prince of Anhalt-Bernburg", ["Bernhard V, Prince of Anhalt- Bernburg( died 24 June 1420) was a German prince of the House of Ascania and ruler of the principality of Anhalt- Bernburg.", "He was the eldest son of Henry IV, Prince of Anhalt- Bernburg, by his wife Sophie, a possible member of the House of Stolberg."]]]
supporting_facts: [["Otto III, Prince of Anhalt-Bernburg", 1], ["Bernhard III, Prince of Anhalt-Bernburg", 1]]
evidences: [["Otto III, Prince of Anhalt-Bernburg", "father", "Bernhard III"], ["Bernhard III", "father", "Bernhard II, Prince of Anhalt-Bernburg"]]
answer: Bernhard II, Prince of Anhalt-Bernburg