Kerwin Leopold returned home but could hardly remain the face of the Family. It was a time even more intolerant of Vampires than now and, consumed by his desire for blood and his quest for Enlightenment, he decided he wasn't in a good enough headspace to lead the Leopold Family anyway so he recused himself.
He kept a few of the Loepold Family's most loyal men with him, rewarding them with the gift of Vampirism should they please him enough in the completion of their tasks which were simply to bring him those he could feed on.
Soon, it was clear that they needed to expand. There were starting to be too many disappearances in the Capital and environs and to bring down the scrutiny of the Empire's strongest monster hunters and Vampire haters upon them would not bode well no matter how hidden they were.