Besides the sons of the Advocate, his two sons-in-law, Brederode, Seignior of Veenhuizep, and Cornelis van der Myle, were constantly employed? in important embassies.  Van der Myle had been the first ambassador to the great Venetian republic, and was now placed at the head of the embassy to France, an office which it was impossible at that moment for the Advocate to discharge.  At the same critical moment Barneveld’s brother Elias, Pensionary of Rotterdam, was appointed one of the special high commissioners to the King of Great Britain.

It is necessary to give an account of this embassy.

They were provided with luminous and minute instructions from the hand of the Advocate.

They were, in the first place, and ostensibly, to thank the King for his services in bringing about the truce, which, truly, had been of the slightest, as was very well known.  They were to explain, on the part of the States, their delay in sending this solemn commission, caused by the tardiness of the King of Spain in sending his ratification to the treaty, and by the many disputations caused by the irresolutions of the Archdukes and the obstinacy of their commissioners in regard to their many contraventions of the treaty.  After those commissioners had gone, further hindrances had been found in the “extraordinary tempests, high floods, rising of the waters, both of the ocean and the rivers, and the very disastrous inundations throughout nearly all the United Provinces, with the immense and exorbitant damage thus inflicted, both on the public and on many individuals; in addition to all which were to be mentioned the troubles in the city of Utrecht.”

They were, in almost hyperbolical language, directed to express the eternal gratitude of the States for the constant favours received by them from the crown of England, and their readiness to stand forth at any moment with sincere affection and to the utmost of their power, at all times and seasons, in resistance of any attempts against his Majesty’s person or crown, or against the Prince of Wales or the royal family.  They were to thank him for his “prudent, heroic, and courageous resolve to suffer nothing to be done under colour of justice, authority, or any other pretext, to the hindrance of the Elector of Brandenburg and Palatine of Neuburg, in the maintenance of their lawful rights and possession of the principalities of Julich, Cleve, and Berg, and other provinces.”

By this course his Majesty, so the commissioners were to state, would put an end to the imaginations of those who thought they could give the law to everybody according to their pleasure.

They were to assure the King that the States-General would exert themselves to the utmost to second his heroic resolution, notwithstanding the enormous burthens of their everlasting war, the very exorbitant damage caused by the inundations, and the sensible diminution in the contributions and other embarrassments then existing in the country.