He's met this guy, de la Motte.

这时候他遇到了拉莫特夫妇。

She marries an officer of rather dubious noble title, who was called, quite forgettably, the Marquis de la Motte.

她嫁给了一名自称是贵族的军官，他就是拉莫特侯爵 名字很不好记。