At the Basilique St. Denis lies the Tomb of Kings, where many of the Kings of France, from Clovis to Louis XVI have been buried. Clovis was actually originally buried at the Abbey of St. Genevieve and only moved to St. Denis in the 18th century (in the great monarchial round up!). The picture here is Childerbert I (I think).
Here are a smattering of Kings and Queens. Picture this as your characters enter the tomb, just before they start to rise up from the dead (actually I'm pretty sure Malady of Kings adventure module has a scene very much like this).