During his primacy (1616-1637), when he had the whole influence of the court, and the sympathy and the assistance of the Catholic world behind him, he put the finishing touches to his life's labour by founding a great Catholic university at Nagyszombat (1635), and publishing a Hungarian translation of the Bible to counteract the influence of Gaspar Karoli's widely spread Protestant version.
But Louis always preferred arbitration to war, and the peace congresses of Nagyszombat (1360) and of Pressburg (1360) summoned by him adjusted all the outstanding differences between the central European powers.
Louis died suddenly at Nagyszombat on the 10th of September 1382.
In 1619 he founded a seminary for theological candidates at Nagyszombat, and in 1623 laid the foundations of a similar institution at Vienna, the still famous Pazmanaeum, at a cost of 200,000 florins.
The eldest of these, Count Antal (1676-1722), distinguished himself in the war against Rakoczy in 1703, but changed sides in 1704 and commanded the left wing of the Kuruczis at the engagements of Nagyszombat (1704) and Vereskii (1705).