appears to be the characteristic of a Fleming.

The Bishop gave us a grand supper, and after supper a ball, to which he
had invited all the ladies of the city. As soon as the ball was opened
he withdrew, in accordance with the Spanish ceremony; but M. d'Ainsi did
the honours for him, and kept me company during the ball, conducting me
afterwards to a collation, which, considering his command at the citadel,
was, I thought, imprudent. I speak from experience, having been taught,
to my cost, and contrary to my desire, the caution and vigilance
necessary to be observed in keeping such places. As my regard for my
brother was always predominant in me, I continually had his instructions
in mind, and now thought I had a fair opportunity to open my commission
and forward his views in Flanders, this town of Cambray, and especially
the citadel, being, as it were, a key to that country. Accordingly I
employed all the talents God had given me to make M. d'Ainsi a friend to
France, and attach him to my brother's interest. Through God's
assistance I succeeded with him, and so much was M. d'Ainsi pleased with
my conversation that he came to the resolution of soliciting the Bishop,
his master, to grant him leave to accompany me as, far as Namur, where
Don John of Austria was in waiting to receive me, observing that he had a
great desire to witness so splendid an interview. This Spanish Fleming,
the Bishop, had the weakness to grant M. d'Ainsi's request, who continued
following in my train for ten or twelve days. During this time he took
every opportunity of discoursing with me, and showed that, in his heart,
he was well disposed to embrace the service of France, wishing no better
master than the Prince my brother, and declaring that he heartily
despised being under the command of his Bishop, who, though his
sovereign, was not his superior by birth, being born a private gentleman
like himself, and, in every other respect, greatly his inferior.