Hendrik van Rensselaer was evenals diens tweelingbroer Johan, hopman in het Staatse leger
1580, the Spaniards, through the treason of Count Rennenberg, had taken the city of Groningen. The States General ordered Capt. Johan Van Rensselear to muster a company of 100 foot soldiers for the defense of the province. In 1583, he served with the troops under Count Van den Bergh. He and his wife received from the States General a pension of 200 guilders yearly, this to revert, after the death of the survivor, to his nephew, Kiliean. They had no children.