John II, Prince of Anhalt-Zerbst
John II, Prince of Anhalt-Zerbst (died 11 April 1382) was a German prince of the House of Ascania and ruler of the principality of Anhalt-Zerbst.
He was the youngest son of Albert II, Prince of Anhalt-Zerbst, by his second wife Beatrix, daughter of Rudolf I, Elector of Saxony and Duke of Saxe-Wittemberg.
Albert VI, Prince of Anhalt-Köthen
Albert VI, Prince of Anhalt- Köthen( died 9 January 1475) was a German prince of the House of Ascania and ruler of the principality of Anhalt- Köthen.
He was the youngest son of Albert IV, Prince of Anhalt- Köthen, but the eldest child of his second wife Elisabeth, daughter of Gebhard XI, Count of Querfurt.
Emmanuel Lebrecht, Prince of Anhalt-Köthen
Emmanuel Lebrecht of Anhalt-Köthen (Köthen, 20 May 1671 – Köthen, 30 May 1704), was a German prince of the House of Ascania and ruler of the principality of Anhalt-Köthen.
He was the only child of Emmanuel, Prince of Anhalt-Köthen, by his wife Anna Eleonore, daughter of Henry Ernest, Count of Stolberg.
Augustus Christian Frederick, Duke of Anhalt-Köthen
Augustus Christian Frederick of Anhalt-Köthen (Köthen, 18 November 1769 – Schloss Geuz, 5 May 1812), was a German prince of the House of Ascania, ruler of the principality of Anhalt-Köthen, and from 1806 the first "Duke of Anhalt-Köthen."
He was the eldest son of Karl George Lebrecht, Prince of Anhalt-Köthen, by his wife Louise Charlotte, daughter of Frederick, Duke of Schleswig-Holstein-Sonderburg-Glücksburg.
Magnus, Prince of Anhalt-Köthen
Magnus, Prince of Anhalt- Köthen( 1455 – 29 October 1524) was a German prince of the House of Ascania and ruler of the principality of Anhalt- Köthen.
He was the third( but eldest surviving) son of Adolph I, Prince of Anhalt- Köthen, by his wife Cordula, daughter of Albert III, Count of Lindau- Ruppin.
Albert IV, Prince of Anhalt-Köthen
Albert IV, Prince of Anhalt-Köthen
(d. Coswig, 24 November 1423), was a German prince of the House of Ascania and ruler of the principality of Anhalt-Zerbst until 1396, when he became the first ruler of the principality of Anhalt-Köthen.
He was the second son of John II, Prince of Anhalt-Zerbst, by his wife Elisabeth, daughter of John I, Count of Henneberg-Schleusingen.
Adolph II, Prince of Anhalt-Köthen
Adolph II, Prince of Anhalt- Köthen( 16 October 1458 – 24 March 1526, in Merseburg), was a German prince of the House of Ascania and ruler of the principality of Anhalt- Köthen.
A Roman Catholic Bishop of Merseburg, he remained until his death a staunch opponent of Martin Luther.
He was the fifth and youngest son of Adolph I, Prince of Anhalt- Köthen, by his wife Cordula, daughter of Albert III, Count of Lindau- Ruppin.
Adolph I, Prince of Anhalt-Köthen
Adolph I, Prince of Anhalt- Köthen( died Zerbst, 28 August 1473), was a German prince of the House of Ascania and ruler of the principality of Anhalt- Köthen.
He was the eldest son of Albert IV, Prince of Anhalt- Köthen, by his first wife Elisabeth, daughter of Gebhard III, Count of Mansfeld.
Philip, Prince of Anhalt-Köthen
Philip, Prince of Anhalt-Köthen (31 May 1468 – 13 November 1500) was a German prince of the House of Ascania and ruler of the principality of Anhalt-Köthen.
He was the only son of Albert VI, Prince of Anhalt-Köthen, by his wife Elisabeth, daughter of Günther II, Count of Mansfeld.
Waldemar V, Prince of Anhalt-Köthen
Waldemar V, Prince of Anhalt- Köthen( died 1436) was a German prince of the House of Ascania and ruler of the principality of Anhalt- Köthen.
He was the second son of Albert IV, Prince of Anhalt- Köthen, by his first wife Elisabeth, daughter of Gebhard III, Count of Mansfeld.

Question: Who is Albert Iv, Prince Of Anhalt-Köthen's paternal grandfather?
Answer: Albert II, Prince of Anhalt-Zerbst