He succeeded to his father's rank and estates. He too fell foul of his lord, duke William of Normandy, and was sent into exile in about 1060. Recalled in 1063 when William's invasion of Maine made expedient a reconciliation with the barons of southern Normandy, Ralph thereafter served his duke faithfully. He fought at the Battle of Hastings in 1066 and though he did not personally acquire any lands in England, other members of the family did: Domesday Book reveals Tosnys holding estates in Nottinghamshire, Lincolnshire, and Yorkshire. Like his father Roger, Ralph visited Spain (between 1066 and 1076): we do not know whether this was in quest of military adventure or as a pilgrim to Santiago de Compostela. Ralph lived to a considerable age. Before his death in 1102 he saw his son-in-law Baldwin of Boulogne, one of the leaders of the first crusade, established in the east first as count of Edessa (1098-1100) and then as king of jerusalem (1100-18). The world of the Tosnys and their connections was a big one: Normandy, Apulia, Catalonia, England, Syria. 266

Horace Round writes: "Grandson of a Count of Barcelona, stepson of a Count of Evreux, son-in-law of Simon de Montfort, brother-in-law of the Earl of Hertford, and Father-in-law of a King of Jerusalem, Ralf was no ordinary Baron."

Weis' "Ancestral Roots. . ." (98A:24).
He was at DUKE WILLIAM's court in 1050 and in 1054 he took part in his victory over the French at Mortremer. He was sent by DUKE WILLIAM to alarm KING HENRY I of France with the news. About 1060 Ralph, along with HUGH DE GRANDMESNIL and Ernald d'Echauffer, were banished and deprived of their lands by DUKE WILLIAM. In revenge, Ralph and Ernald made incursions into Normandy and burned the town of St. Evroul; but in 1063 THE DUKE recalled them and restored their lands.
Ralph was one of DUKE WILLIAM's inner council at the time of the invasion of England and he fought at the Battle of Hastings in 1066. Cokayne, in his "Complete Peerage", states that Ralph's estates, given to him by WILLIAM THE CONQUERER sometime between 1066 and the Domesday survey of 1086, included holdings in the counties of Berks, Essex, Gloucester, Hereford, Herts, Norfolk, and Worcester, with the castle of Clifford. This would certainly seem to make him the grandfather of MARGARET, who married WALTER DE CLIFFORD. The "caput" of his barony was at Flamstead, Herts.
Following the death of KING WILLIAM in 1087, Ralph was one of the Norman nobles who expelled the royal garrisons from their castles. In 1088 he served under Duke Robert in the war against Maine. As the result of a feud between his wife, ISABEL, and ISABEL's sister-in law, Hawise, Hawise's husband (ISABEL's brother), William Count of Evreux, attacked Ralph. Ralph appealed in vain to the Duke of Normandy for help. He then appealed directly to King William Rufus, who ordered his adherents in Normandy to Ralph's aid. The Count of Evreux besieged Conches, but was defeated by Ralph's forces. After three years of fighting a peace was concluded. When King William Rufus and his brother, the Duke of Normandy finally made peace in 1091, Ralph's lands were among those given from the Duke to the King.
Thereafter, Ralph was one of the king's staunchest supporters. After the death of King William Rufus, in 1100, Ralph joined forces with the Count of Evreux to invade the lands of ROBERT DE BEAUMONT, COUNT OF MEULAN. This was in revenge for previous political back-stabbing.