Among those who preserved a friendship for him, there was one whom it
would seem he had no reason to count upon: this was Prince Frederic
Henry of Nassau, brother to the Prince of Orange, and who after the
death of Maurice was himself Stadtholder. They maintained a
correspondence by letters even at the time when the people of Holland
were most exasperated against Grotius; and by a Letter from that Prince,
which is still remaining, we may judge that Grotius did him good service
at Paris; and that Frederic Henry was greatly disposed to serve him.
This Letter deserves to be copied entire: it is dated August 4, 1622.

"Sir, I thank you for the good offices you have done me with some of the
King's Council, and beg of you to continue them both with these, and
with others, as you shall think proper; assuring you that I shall
acknowledge your friendship on all occasions where I can serve you;
being bound to it by the friendship which you have ever shewn to me. I
have asked your brother-in-law Mr. Reigersberg to write to you
particularly about an affair in which I should be glad to have your
opinion: you will oblige me much by sending it, as you have already done
by the memorial you remitted to me; for which I sincerely thank you. I
could wish to be of use in your affairs in this Country, and would
labour in them most chearfully: but you know the constitution of things
is such, that neither I, nor your other friends, can serve you agreeably
to our wishes. I would fain hope that time will bring about some change,
and that I shall see you again here esteemed and honoured as your great
qualities deserve; which will give me no less pleasure than I received
from your regaining your liberty. In the mean time, I wish you, while at
a distance from your country, all the satisfaction, prosperity, and
happiness which you can desire. This I pray God to grant, and to me an
opportunity of shewing by my actions that I am yours most affectionately
to serve you, Henry de Nassau."