 Grotius, on the other side, argued that the States could not be judged on religious grounds, and their rights were independent of religious learning or beliefs.The truce with Spain that had allowed the debate was coming to a close in 1621 so there was an urge to have the matter settled before then.Conrad's son Adolph Vorstius (Delft, 1597 – Leiden, 1663) was to become professor in medicine at the Leiden University in 1636.