Sire:
“Latin Trans” (freeware, and worth every penny) tells me your motto off to the right, sez:
“Slaughter these. Newness in fact Master quae are her.”

I’m having my doubts about that.

It should be rendered as “Kill them all. God will know his own.” I’ve also found it rendered as “Kill them all. The Lord has known indeed, who are his.”

This comes from Abbot Arnaud who was asked during the crusades against the Cathars in France in the early 1200s what to do when the crusader army entered the city of Beziers. The military captain asked how his men were to distinguish true Catholics from Cathars. The Abbot responded thus.

Abbot Arnaud earned himself a niche in the all-time Hall of Villainy there, boy howdy. In a just or rational world, we would have been bronzed for that policy.