The 13th-century abbots Albert (1199–1217) and Theoderich II (1256–1295) added significantly to the buildings and architectural decoration, including the monumental tomb of the founder.
The consequent improvement in discipline led to a fruitful literary period in the abbey's history, prominent in which were Jakob Siberti, Tilman of Bonn and Benedict of Munstereifel, but principally Prior Johannes Butzbach (d. 1526).
Of particular note were Fathers Gerhard Schneemann, Theodor Granderath and Florian Reiss, who produced a number of important works: the "Collectio lacensis" ("Acta et decreta sacrorum conciliorum recentiorum", 7 volumes, Freiburg, 1870–1890); the "Philosophia lacensis", a collection of learned books on the different branches of philosophy (logic, cosmology, psychology, theodicy, natural law) and published at Freiburg, 1880–1900; and, perhaps best-known, the "Stimmen aus Maria-Laach" ("Voices from Maria Laach"), appearing from 1865, at first as individual pamphlets defending against liberalism within the Roman Catholic church, and from 1871 as a regular periodical.
Due to a considerable reduction of the lake level in the early 19th century, serious and unexpected structural damages to the church vaults and roofs were detected.
In particular, Heinrich Böll depicted (in Billiards at Half-past Nine) a Benedictine monastery whose monks actively and voluntarily collaborated with the Nazis, and is generally considered to have had Maria Laach in mind.
In 2004 researcher Marcel Albert published a work (translated under the title "The Maria Laach Benedictine Abbey and National Socialism").
[1] The book was reviewed by Dr. Mark Edward Ruff of Saint Louis University, who stresses the centrality of Maria Laach in Catholic conservatism during the Weimar Republic, and its unique relationship (even among Benedictine monasteries) with the Nazis.
[2] In its closing chapters, the book shows that the abbey cultivated a positive relationship to Adenauer and the CDU after 1945, but retained its monarchist beliefs.
The abbey church of Maria Laach is considered a masterpiece of German Romanesque architecture,[4] with its multiple towers, large westwork with arcaded gallery, and unique west porch.
The Lion Fountain in the courtyard was added in 1928. Notable features of the interior include the tomb of the founder Pfalzgraf Heinrich II (dating from 1270), 16th-century murals, a Late Romanesque baldachino in the apse, and interesting modern decorations such as mosaics from c. 1910 and stained glass windows from the 1950s.