Klosterkirche St. Margarethen, Monastery church in Altenmarkt an der Alz, Germany.

Klosterkirche St. Margarethen in Baumburg, part of Altenmarkt an der Alz, is a baroque wall-pillar church built in the mid-18th century on the foundations of a 12th-century Romanesque basilica. The west facade retains two towers with 17th-century onion domes, and a two-storey tempietto-like porch with three portals and a figure of Saint Margaret stands before it. The interior has four bays under a barrel vault with stucco work by Bernhard Rauch and Hans Georg Funk and ceiling frescoes by Felix Anton Scheffler.

A first monastery church, consecrated in 1023 by Salzburg Archbishop Hartwig, stood here before Countess Adelheid von Sulzbach founded an Augustinian canons' house in the early 12th century. Its Romanesque basilica, 45 metres long and 20 wide with three eastern apses and a twin-tower west front, was consecrated in 1156 by Archbishop Eberhard I. For the 600th anniversary in 1756, Provost Joachim Vischer had Franz Alois Mayr of Trostberg build the present Baroque church on the old foundations, keeping only the towers with their 17th-century onion domes. After the canons' house was dissolved in 1803, the church survived as a parish church.

The interior shows a blend of white walls and rich decoration, with side altars and stucco work in warm tones created by craftsmen from the Wessobrunn school. Visitors can notice these handcrafted details while walking through and see how religious space was shaped here through color and form.

The church stands in Baumburg, a district of Altenmarkt an der Alz in the Traunstein district of Upper Bavaria. The west front is entered through a two-storey, tempietto-like porch with three portals at ground level; the figure of Saint Margaret stands in the middle niche of the upper storey. The unplastered west facade keeps its two towers with onion domes added in the 17th century.

The high altar painting, commissioned in 1757 by Elector Maximilian III Joseph and his wife Maria Anna, shows Louis XIV of France and Maria Theresa presenting a longed-for heir to Saint Margaret. The Augsburg painter Joseph Hartmann placed the donor couple's own hope for offspring in the same scene.