On Maundy Thursday 817 (9 April), Louis and his court were crossing a wooden gallery from the cathedral to the palace in Aachen when the gallery collapsed, killing many.
Pada Kamis Putih 817 (9 April), Ludwig dan istananya melintasi galeri kayu dari katedral ke istana di Aachen ketika galeri tersebut runtuh dan membunuh banyak orang.