The King immediately approved the recommendation of Lord Galway. He knew of Rapin's courage at the battle of the Boyne; and he remembered—as every true captain does remember—the serious wound he had received while accompanying the forlorn hope at the first siege of Limerick. Hence the sudden recall of Rapin from Ireland. On his arrival in London he was presented to the King, and immediately after he entered upon his new function of conducting the education of the future Duke of Portland.
Henry, Lord Woodstock, was then about fifteen. Being of delicate health, he had hitherto been the object of his father's tender care, and it was not without considerable regret that Lord Portland yielded to the request of the King and handed over his son to the government of M. Rapin. Though of considerable intelligence, the powers of his heart were greater than those of his head. Thus Rapin had no difficulty in acquiring the esteem and affection of his pupil.
Portland House was then the resort of the most eminent men of the Whig party, through whose patriotic assistance the constitution of England was placed in the position which it now occupies. Rapin was introduced by Lord Woodstock to his friends. Having already mastered the English language, he had no difficulty in understanding the conflicting opinions of the times. He saw history developing itself before his eyes. He heard with his ears the discussions which eventuated in Acts of Parliament, confirming the liberties of the English people, the liberty of speech, the liberty of writing, the liberty of doing, within the limits of the common law.
All this was of great importance to Rapin. It prepared him for writing his afterwards famous works, his "History of England," and his Dissertation on the Whigs and Tories. Rapin was not only a man of great accomplishments, but he had a remarkable aptitude for languages. He knew French and English, as well as Italian, Spanish, and German. He had an extraordinary memory, and a continuous application and perseverance, which enabled him to suck the contents of many volumes, and to bring out the facts in future years during the preparation of his works. His memory seems to have been of the same order as that of Lord Macaulay, who afterwards made use of his works, and complimented his predecessor as to their value.
According to the custom of those days, the time arrived when Rapin was required to make "the grand tour" with his pupil and friend, Lord Woodstock. This was considered the complement of English education amongst the highest classes. It was thought necessary that young noblemen should come in contact with foreigners, and observe the manners and customs of other countries besides their own; and that thus they might acquire a sort of cosmopolitan education. Archbishop Leighton even considered a journey of this sort as a condition of moral perfection. He quoted the words of the Latin poet: "Homo sum, et nihil hominem à me alienum puto."
No one could be better fitted than Rapin to accompany the young lord on his foreign travels. They went to Holland, Germany, France, Spain, and Italy. Rapin diligently improved himself, while instructing his friend. He taught him the languages of the countries through which they passed; he rendered him familiar with Greek and Latin; he rendered him familiar with the principles of mathematics. He also studied with him the destinies of peoples and of kings, and pointed out to him the Divine will accomplishing itself amidst the destruction of empires. Withal he sought to penetrate the young soul of the friend committed to his charge with that firmness of belief and piety of sentiment which pervaded his own.
It was while in Italy that the Earl of Portland, at the instigation of Rapin, requested copies to be made for him of the rarest and most precious medals in point of historic interest; and also to purchase for him objects of ancient workmanship. Hence Rapin was able to secure for him the Portland Vase, now in the British Museum, one of the most exquisite products of Roman and Etruscan ceramic art.
In 1699, the Earl of Portland was sent by William III. as ambassador to the court of Louis XIV., in connection with the negotiations as to the Spanish succession. Lord Woodstock attended the embassy, and Rapin accompanied him. They were entertained at Versailles. Persecution was still going on in France, although about eight hundred thousand persons had already left the country. Rapin at one time thought of leaving Lord Woodstock for a few days, and making a rapid journey south to visit his friends near Toulouse. But the thought of being made a prisoner and sent to the galleys for life stayed him, and he remained at Versailles until the return of the embassy.
Rapin remained with Lord Woodstock for thirteen years. In the meantime he had married, at the Hague, Marie Anne Testart, a refugee from Saint-Quentin. Jean Rou describes her as a true helpmeet for him, young, beautiful, rich, and withal virtuous, and of the most pleasing and gentle temper in the world. Her riches, however, were not great. She had merely, like Rapin, rescued some portion of her heritage from the devouring claws of her persecutors. Rapin accumulated very little capital during his tutorship of Lord Woodstock; but to compensate him, the King granted him a pension of £100 a year, payable by the States of Holland, until he could secure some better income.
Rapin lived for some time at the Hague. While there he joined a society of learned French refugees. Among them were Rotolf de la Denèse, Basnage de Beauval, and Jean Rou, secretary to the States-General. One of the objects of the little academy was to translate the Psalms anew into French verse; but before the version was completed, Rapin was under the necessity of leaving the Hague. William III., his patron, died in 1701, when his pension was stopped. He was promised some remunerative employment, but he was forgotten amidst the press of applicants.