Ranulph de Gernon was 2nd Earl of Chester, Vicomte d'Avranches in Normandy. He was born 1100, Castle of Gernon in Normandy, France. Ranulph was the son of Ranulph III le Meschin , first Earl of Chester and Lucy. In 1141, he married Maud of Gloucester (d. 29 July 1189), daughter of Robert de Caen, Earl of Gloucester and Maud Fitz-Hamon. Ranulph and Maud had a son, Hugh of Kevelioc (1147-1180).
