Philipp I, Count of Hanau-Münzenberg
Count Philipp I of Hanau-Münzenberg, nicknamed "Philipp the Younger", (20 September 1449, at Windecken Castle – 26 August 1500)
was a son of Count Reinhard III of Hanau and Countess Palatine Margaret of Mosbach.
He was the Count of Hanau from 1452 to 1458.
The county was then divided between him and his uncle
Philipp the Elder.
Philipp the Younger
received Hanau-Münzenberg and ruled there from 1458 until his death.
Countess Catharina Belgica of Nassau
Countess Catharina Belgica of Nassau (31 July 1578 – 12 April 1648) was a countess of Hanau-Münzenberg by marriage to Philip Louis II, Count of Hanau-Münzenberg, and regent of Hanau-Münzenberg from 1612 until 1626.
She was the third daughter of William the Silent and his third spouse Charlotte of Bourbon.
Countess Palatine Margaret of Mosbach
Countess Palatine Margaret of Mosbach (2 March 1432 – 14 September 1457) was the eldest daughter of Count Palatine Otto I of Mosbach and his wife, Johanna of Bavaria-Landshut.
She married on 11 July 1446 to Count Reinhard III of Hanau, who succeeded his father as ruling Count in 1451.
Johanna of Hanau-Münzenberg
Countess Johanna of Hanau-Münzenberg (1610 – 13 September 1673) was a daughter of Count Albert of Hanau-Münzenberg-Schwarzenfels and Countess Ehrengard of Isenburg (1577 – 1637).
Hanau-Münzenberg-Schwarzenfels was a cadet branch of Hanau-Münzenberg.
Philipp III, Count of Hanau-Münzenberg
Count Phillip III of Hanau- Münzenberg( 30 November 1526 – 14 November 1561) ruled the County of Hanau- Münzenberg from 1529 until his death.
Philipp Ludwig III, Count of Hanau-Münzenberg
Count Philipp Ludwig III of Hanau- Münzenberg( in Hanau – 12 November 1641 in The Hague) was the last count of the main Hanau- Münzenberg line of the House of Hanau.
After his death, the Hanau- Münzenberg- Schwarzenfels line inherited Hanau- Münzenberg.
Reinhard IV, Count of Hanau-Münzenberg
Count Reinhard IV of Hanau- Münzenberg( born: 14 March 1473 – died: 30 January 1512) succeeded in 1500 his father Philipp I of Hanau- Münzenberg( 1449 – 1500) in the government of the County of Hanau- Münzenberg.
He served as co-regent from 1496 onwards.
Philipp Moritz, Count of Hanau-Münzenberg
Philipp Moritz of Hanau- Münzenberg( 25 August 1605 – 3 August 1638 in Hanau) succeeded his father as Count of Hanau- Münzenberg in 1612.
Albrecht of Hanau-Münzenberg
Albert of Hanau- Münzenberg( 12 November 1579 – 19 December 1635 in Strasbourg) was the younger son of Philip Louis I of Hanau- Münzenberg( 1553- 1580) and his wife, Countess Magdalena of Waldeck( 1558- 1599).
The only sons of his parents to reach adulthood were Albert and his elder brother Philip Louis II.
Albert's son John Ernest was the last male member of the Hanau- Münzenberg line of the House of Hanau.
Philipp Ludwig I, Count of Hanau-Münzenberg
Philipp Ludwig I, Count of Hanau- Münzenberg( 21 November 1553 – 4 February 1580) succeeded his father in the government of the County of Hanau- Münzenberg in 1561.

Question: Who is Philipp I, Count Of Hanau-Münzenberg's maternal grandfather?
Answer: Otto I