In the beginning of June, 1638[331], Grotius waited on the King at St. Germains: he first thanked his Majesty for intimating to him the Queen's pregnancy; and afterwards enlarged on the praise of justice, and on the title of Just which the King had merited by the laws he enacted, particularly that for abolishing duels, and the protection granted to foreign princes. He entered into a detail of the favours which the King had received from Providence since his accession to the throne: the extinction of the civil wars, the restoration of the royal authority, the successes both by sea and land, the passage of the Alps forced, and the frontiers of the kingdom enlarged. He added, that after such a series of felicity, the only thing left to be desired was that his Majesty's posterity might long reign in France; and for this her Majesty's pregnancy entitled them to hope; that the Swedes entertained the same sentiments, and flattered themselves a perfect harmony would always subsist between the two kingdoms. He concluded with soliciting the King to augment the Duke of Weymar's troops, against whom the Imperialists made the greatest efforts; and to procure Marshal Horne's liberty, who was made prisoner at the battle of Nordlinguen: he represented that his Majesty might obtain it when he pleased, since he had so great a number of the enemies generals in his power, and assured him that the Queen his mistress would take it as a very high obligation. The Ambassador presented afterwards letters from the Queen of the twelfth of April, and concluded with observing, that he had reason to think a considerable body of troops would be sent from Sweden into Germany this same month of June. The King replied, that he had a great friendship for the Queen of Sweden, and had already given proofs of his good disposition towards her; that he had sent succours to the Duke of Weymar, and would send still more considerable ones if necessary; that as to the exchange of Marshal Horne, there was only John de Vert with whom it could be made; and that General was not his prisoner, but the Duke of Weymar's, to whom he had promised to deliver him on demand. Grotius replied, that he did not doubt but the Duke of Weymar would shew all possible deference to the King's inclination, if he should find his Majesty disposed to procure Marshal Horne's discharge, and that the Queen had written to the Duke on that subject. Some days after this audience, Chavigny[332] informed the Swedish Ambassador that John De Vert was the King's prisoner, though Lewis XIII. had said the contrary.