Frederick IV, Count of Zollern
Count Friedrich IV of Zollern, also known as Burgrave Friedrich II of Nuremberg, was Burgrave of Nuremberg from 1204 to 1218 and Count of Zollern from 1218 until his death.
Conrad I, Burgrave of Nuremberg
Conrad I of Nuremberg( 1186 – 1261) was a Burgrave of Nuremberg of the House of Hohenzollern.
He was the elder son of Frederick I of Nuremberg and Sophie of Raabs.
John III, Burgrave of Nuremberg
John III of Nuremberg (c. 1369 – 11 June 1420 in Plassenburg), Margrave of Brandenburg-Kulmbach from the House of Hohenzollern.
He was elder son of Frederick V of Nuremberg and Elisabeth of Meissen.
Beatrice of Nuremberg
Beatrix of Nuremberg( Nuremberg – 10 June 1414, Perchtoldsdorf) was a daughter of Frederick V, Burgrave of Nuremberg and his wife Elisabeth of Meissen.
In 1375 in Vienna, she married Duke Albert III of Austria.
They had one son: Albert IV.
John I, Burgrave of Nuremberg
John I, Burgrave of Nuremberg (– 1300) was a member of the House of Hohenzollern and was Burgrave of Nuremberg from 1297 until his death.
He was the son of Burgrave Frederick III of Nuremberg and his second wife, Helen of Saxony (d. 1309).
John I married in 1297 with Agnes of Hesse (d. 1335).
He ruled the Burgraviate of Nuremberg jointly with his younger brother Frederick IV.
After John I died childless in 1300, Frederick IV ruled alone.
Elisabeth of Meissen
Elisabeth of Meissen, Burgravine of Nuremberg (22 November 1329 – 21 April 1375) was the daughter of Frederick II, Margrave of Meissen and Mathilde of Bavaria and a member of the House of Wettin.
John II, Burgrave of Nuremberg
John II of Nuremberg( 1309 – 1357) was a Burgrave of Nuremberg from the House of Hohenzollern.
He was the elder son of Frederick IV of Nuremberg and Margarete of Görz.
Frederick IV, Burgrave of Nuremberg
Frederick IV of Nuremberg( 1287–1332) from the House of Hohenzollern was Burgrave of Nuremberg from 1300 to 1332.
He was the younger son of Burgrave Frederick III from his second marriage with the Ascanian princess Helene, daughter of Duke Albert I of Saxony.
Frederick III, Burgrave of Nuremberg
Frederick III of Nuremberg( 1220 – 14 August 1297 in Cadolzburg), Burgrave of Nuremberg from the House of Hohenzollern, was the eldest son of Conrad I of Nuremberg and Adelheid of Frontenhausen.
Conrad II of Raabs
Conrad II of Raabs was from about 1160 until his death Burgrave of the medieval Burgraviate of Nuremberg.

Question: Who is the maternal grandfather of John Iii, Burgrave Of Nuremberg?
Answer: Frederick II