Adelaide of Holland
Adelaide of Holland( – buried 9 April 1284), Countess of Hainaut, was a Dutch regent.
She was a daughter of Floris IV, Count of Holland and Matilda of Brabant.
She was also a sister of William II, Count of Holland and King of Germany.
She acted as regent for her nephew Count Floris V during his minority.
Hubba bint Hulail
Hubba bint Hulail was the grandmother of Hashim ibn' Abd Manaf, thus the great- great- great- grandmother of the Islamic" Nabī"( Prophet) Muhammad ibn Abdullah.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
William I, Count of Holland
William I (c. 1167 – 4 February 1222), Count of Holland from 1203 to 1222.
He was the younger son of Floris III and Ada of Huntingdon.
Floris III, Count of Holland
Floris III of Holland (1141 – August 1, 1190), Count of Holland from 1157 to 1190.
He was a son of Dirk VI and Sophia of Rheineck, heiress of Bentheim.
William I, Duke of Bavaria
William I, Duke of Bavaria- Straubing( Frankfurt am Main, 12 May 1330 – 15 April 1389, Le Quesnoy), was the second son of Emperor Louis IV and Margaret II of Hainaut.
He was also known as William V, Count of Holland, as William III, Count of Hainaut and as William IV, Count of Zeeland.
Otto III van Holland
Otto van Holland( died 27 March 1249) was a bishop of Utrecht from 1233 to 1249.
Otto was the second son of William I, Count of Holland and his first wife Adelaide of Guelders.
He was elected as bishop in 1233, but because of resistance from the canons of Utrecht, his consecration was delayed until 1245.
He emerged as a forceful ruler who involved himself primarily in secular affairs.
After the death of his brother Floris IV, Count of Holland in 1234, he became guardian of Floris' son William II, Count of Holland, and he governed the County of Holland.
He resolved the problems in Drenthe, problems which had cost his predecessor Otto II of Lippe his life.
He also subjected the lords of Goor to his authority.
Ada of Holland
Ada of Holland( c. 1163–1205) was the daughter of Floris III, Count of Holland and his wife Ada of Huntingdon.
She was the sister of Dirk VII, Count of Holland and William I, Count of Holland.
In 1176 she married Otto I of Brandenburg, becoming Margravine of Brandenburg until his death in 1184.
This was Otto's second marriage.
He had been married to Judith of Poland.
Otto already had two sons from his marriage to Judith, Otto( who later succeeded his father as Margrave of Brandenburg) in 1149, and Henry( who inherited the Counties of Tangermünde and Gardelegen) in 1150.
Ada and Otto had a son named Albert II who would in time succeeded his half- brother Otto II as Margrave of Brandenburg in 1205.
Mary of Avesnes
Marie of Hainaut( 1280–1354) was the daughter of John II, Count of Holland and Philippa of Luxembourg, her brother was William I, Count of Hainaut.
Tjuyu
Tjuyu( sometimes transliterated as Thuya or Thuyu) was an Egyptian noblewoman and the mother of queen Tiye, and the wife of Yuya.
She is the grandmother of Akhenaten, and great grandmother of Tutankhamun.

Question: Who is the paternal grandmother of William I, Count Of Holland?
Answer: Sophia of Rheineck