In 1418, Ludwig the Bearded laid the foundation stone for the Neue Veste (New Citadel), in the centre of which rises the Neues Schloss. Today, 17 richly decorated cannons in the castle courtyard reflect the scale of the weapons arsenal at that time.
http://www.ingolstadt-tourismus.de/en/exploreingolstadt/sightseeing/new-castle.html