Question: Ranulf de Gernon, 4th Earl of Chester was the son of the magnate who originated in what city in Normandy?

Context paragraphs:
Ranulf de Gernon, 4th Earl of Chester: Ranulf II (also known as Ranulf de Gernon) (1099–1153) was an Anglo-Norman potentate who inherited the honour of the palatine county of Chester upon the death of his father Ranulf le Meschin, 3rd Earl of Chester.  He was descended from the Counts of Bessin in Normandy.

Lord of Liddesdale: The Lord of Liddesdale was a magnate in the medieval Kingdom of Scotland; the territorial lordship of Liddesdale was first created by David I of Scotland, perhaps between 1113 and 1124 when the latter was Prince of the Cumbrians.  From an early period the caput of the lordship was Hermitage Castle, the "strength of Liddesdale".  King David gave the territory to Ranulf de Soules, a knight from the Cotentin Peninsula.  It was forfeited by the Soulis (de Soules) family in the 14th century and eventually passed to the Douglases, only to be lost to the Hepburns by order of James IV.  Archibald Douglas, 5th Earl of Angus was renumerated for this loss by the lordship of Bothwell Castle, although the Hepburn Earls of Bothwell retained the territorial designation

Maud of Gloucester, Countess of Chester: Maud of Gloucester, Countess of Chester (died 29 July 1189), also known as Matilda, was an Anglo-Norman noblewoman and the daughter of Robert, 1st Earl of Gloucester, an illegitimate son of King Henry I of England and Mabel, daughter of Robert fitz Hamon.  Her husband was Ranulf de Gernon, 4th Earl of Chester (died Dec. 16, 1153).

Hugh de Kevelioc, 5th Earl of Chester: Hugh de Kevelioc, 5th Earl of Chester (1147 – 30 June 1181) was the son of Ranulf de Gernon, 4th Earl of Chester and Maud of Gloucester, daughter of Robert, 1st Earl of Gloucester (otherwise known as Robert de Caen, the illegitimate son of Henry I of England, making her Henry's granddaughter).

Hawise of Chester, 1st Countess of Lincoln: Hawise of Chester, 1st Countess of Lincoln "suo jure" (1180- 6 June 1241/3 May 1243), was an Anglo-Norman noblewoman and a wealthy heiress.  Her father was Hugh de Kevelioc, 5th Earl of Chester.  She was the sister and a co-heiress of Ranulf de Blondeville, 6th Earl of Chester.  She was created suo jure 1st Countess of Lincoln in 1232.  She was the wife of Robert de Quincy, by whom she had one daughter, Margaret, who became heiress to her title and estates.  She was also known as Hawise of Kevelioc.

Ranulf de Blondeville, 6th Earl of Chester: Ranulf de Blondeville, 6th Earl of Chester and 1st Earl of Lincoln (1170–1232), known in some references as the 4th Earl of Chester (in the second lineage of the title after the original family line was broken after the 2nd Earl), was one of the "old school" of Anglo-Norman barons whose loyalty to the Angevin dynasty was consistent but contingent on the receipt of lucrative favours.  He was described as "almost the last relic of the great feudal aristocracy of the Conquest".

Humphrey de Bohun, 7th Earl of Hereford: Humphrey de Bohun, 7th Earl of Hereford, 6th Earl of Essex, 2nd Earl of Northampton, KG (25 March 1341 – 16 January 1373) was the son of William de Bohun, 1st Earl of Northampton and Elizabeth de Badlesmere, and grandson of Humphrey de Bohun, 4th Earl of Hereford by Elizabeth of Rhuddlan, daughter of King Edward I.  He became heir to the Earldom of Hereford after the death of his childless uncle Humphrey de Bohun, 6th Earl of Hereford.

Ranulf le Meschin, 3rd Earl of Chester: Ranulf le Meschin, 3rd Earl of Chester (1070−1129) was a late 11th- and early 12th-century Norman magnate based in northern and central England.  Originating in Bessin in Normandy, Ranulf made his career in England thanks to his kinship with Hugh d'Avranches - the earl of Chester, the patronage of kings William II Rufus and Henry I Beauclerc, and his marriage to Lucy, heiress of the Bolingbroke-Spalding estates in Lincolnshire.

Kersal Priory: Kersal Priory also known as St Leornards, classed as an Alien priory or hemitage, was populated by Cluniac monks.  The priory was dependent on Lenton in Nottinghamshire.  Founded between 1145-1453, granted title by Ranulf de Gernon, 4th Earl of Chester sometime after 1143 and became denizen independent from 1392 and was dissolved in 1538.

Beeston Castle: Beeston Castle is a former Royal castle in Beeston, Cheshire, England (grid reference [ SJ537593] ), perched on a rocky sandstone crag 350 ft above the Cheshire Plain.  It was built in the 1220s by Ranulf de Blondeville, 6th Earl of Chester, (1170–1232), on his return from the Crusades.  In 1237, Henry III took over the ownership of Beeston, and it was kept in good repair until the 16th century, when it was considered to be of no further military use, although it was pressed into service again in 1643, during the English Civil War.  The castle was slighted (partly demolished) in 1646, in accordance with Cromwell's destruction order, to prevent its further use as a stronghold.

Supporting paragraphs: Ranulf de Gernon, 4th Earl of Chester Ranulf le Meschin, 3rd Earl of Chester
Answer: Bessin