Rudolph IV, Prince of Anhalt-Dessau
Rudolph IV, Prince of Anhalt- Dessau( died 7 September 1510) was a German prince of the House of Ascania and ruler of the principality of Anhalt- Dessau.
He was the fifth son of George I, Prince of Anhalt- Dessau, as the fourth- born child of his fourth wife Anna, daughter of Albert VIII, Count of Lindau- Ruppin.
Sigismund II, Prince of Anhalt-Dessau
Sigismund II, Prince of Anhalt- Dessau( died aft. 22 May 1452) was a German prince of the House of Ascania and ruler of the principality of Anhalt- Dessau.
He was the fourth son of Sigismund I, Prince of Anhalt- Dessau, by his wife Judith, daughter of Gebhard XI, Count of Querfurt.
Waldemar IV, Prince of Anhalt-Dessau
Waldemar IV, Prince of Anhalt- Dessau( died aft. 22 July 1417) was a German prince of the House of Ascania and ruler of the principality of Anhalt- Dessau.
He was the eldest son of Sigismund I, Prince of Anhalt- Dessau, by his wife Judith, daughter of Gebhard XI, Count of Querfurt.
George I, Prince of Anhalt-Dessau
George I, Prince of Anhalt- Dessau( – 21 September 1474), was a German prince of the House of Ascania and ruler of the principality of Anhalt- Dessau.
He was the second son of Sigismund I, Prince of Anhalt- Dessau, by his wife Judith, daughter of Gebhard XI, Count of Querfurt.
George II, Prince of Anhalt-Dessau
George II, Prince of Anhalt- Dessau( 1454 – 25 April 1509) was a German prince of the House of Ascania and ruler of the principality of Anhalt- Dessau.
He was the fourth son of George I, Prince of Anhalt- Dessau, as second- born child of his fourth wife Anna, daughter of Albert VIII, Count of Lindau- Ruppin.
Albert V, Prince of Anhalt-Dessau
Albert V, Prince of Anhalt- Dessau( died ca. 1469) was a German prince of the House of Ascania and ruler of the principality of Anhalt- Dessau.
He was the fifth son of Sigismund I, Prince of Anhalt- Dessau, by his wife Judith, daughter of Gebhard XI, Count of Querfurt.
George III, Prince of Anhalt-Dessau
George III, Prince of Anhalt-Dessau (Dessau, 15 August 1507 – Dessau, 17 October 1553), was a German prince of the House of Ascania and ruler of the principality of Anhalt-Dessau, and also a Protestant Reformer.
After 1544 he became the first ruler of the principality of Anhalt-Plötzkau.
George was the third (but second surviving) son of Ernest I, Prince of Anhalt-Dessau, by his wife Margarete, daughter of Henry I, Duke of Münsterberg-Oels and granddaughter of George of Poděbrady, King of Bohemia.
Ernest I, Prince of Anhalt-Dessau
Ernest I, Prince of Anhalt-Dessau (died Dessau, 12 June 1516), was a German prince of the House of Ascania and ruler of the principality of Anhalt-Dessau.
He was the second son of George I, Prince of Anhalt-Dessau, yet the first born by his fourth wife Anna, daughter of Albert VIII, Count of Lindow-Ruppin.
Sigismund III, Prince of Anhalt-Dessau
Sigismund III, Prince of Anhalt-Dessau (1456 - Dessau, 27 November 1487), was a German prince of the House of Ascania and ruler of the principality of Anhalt-Dessau.
He was the fourth son of George I, Prince of Anhalt-Dessau, as third-born child of his fourth wife Anna, daughter of Albert VIII, Count of Lindau-Ruppin.
Countess Henriette Catherine of Nassau
Henriette Catherine of Nassau (10 February 1637 – 3 November 1708) was princess consort of Anhalt-Dessau by marriage to John George II, Prince of Anhalt-Dessau, and regent of Anhalt-Dessau from 1693 to 1698 during the minority (and then the absence) of her son Leopold I, Prince of Anhalt-Dessau.

Question: Who is George Iii, Prince Of Anhalt-Dessau's paternal grandfather?
Answer: George I, Prince of Anhalt-Dessau