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Origin and history

The Château Saint-Léon-Pfalz, located in Eguisheim in the Upper Rhine, is a 13th century building built on the remains of a medieval fortress. Its octagonal wall, classified as a historical monument, is the main vestige of this period. Archaeological and architectural research (labourmarks, bossstones) confirm this dating, excluding the hypothesis of an older origin (VIIIth century), often evoked because of supposed ties with Eberhard, grandson of the Duke of Alsace Etichon. These claims, based on a 12th century chronicle, are now contested, with historians instead placing Eberhard's residence in Haut-Eguisheim, 2.5 km from the village.

In the 13th century, the castle was probably erected in a context of estate rivalries after the extinction of the Counts of Eguisheim (XII century). The succession between the families of Linange, the Margraves of Baden, the Counts of Ferrette and the bishops of Strasbourg could explain its construction. Bishop Berthold finally bought the rights to Eguisheim in 1226, integrating the castle with episcopal goods. Occupied by bailiffs until the Revolution, he served as an administrative residence before being confiscated as a national property in 1795, then sold to an individual who partially destroyed his structures (danjon, portal).

In the 19th century, the castle, then in ruins after a fire in 1877, was bought by the bishopric of Strasbourg in 1885. Under the impetus of Bishop Pierre-Paul Stumpf, a neo-Roman chapel dedicated to Saint Leo IX was built there between 1886 and 1895, replacing the remains of the central dungeon. The architect Charles Winkler, from the Historic Monuments, also supervised the restoration of the house, adding a staircase turret and a neo-renaissance style balcony. The chapel, decorated with frescoes and stained-glass windows depicting Alsatian saints, was consecrated in 1894. Today, the castle belongs to the commune and hosts exhibitions, while the chapel remains accessible to the public.

The enclosure wall, tracing an almost perfect octagon (13 m side), is the only defensive element still visible. Built in yellow and pink sandstone rubble, it was once surrounded by moat (combled in the 18th century) and surmounted by a covered round road. The central dungeon, also octagonal, has disappeared, but its location is marked by the current chapel. The house, backed by the south wall, preserves original snout windows (15th to 16th centuries), while the transformations of the 20th century gave it its present appearance. The excavations of 1994–1995 revealed no vestiges prior to the 13th century, confirming architectural analyses.

The claim that the castle would be the birthplace of Pope Leo IX (XI century), a member of the Eguisheim family, is now questioned. No archaeological or documentary evidence confirms this tradition, popularized in the 19th century. The medieval texts evoking a castrum Egisheim before the 13th century refer in reality to the site of the Haut-Eguisheim, distinct from the urban castle. Despite this controversy, the chapel still commemorates Saint Leo IX, with a reliquary containing a fragment of his skull. The frescoes and stained glass of the chapel, made by artist Martin, illustrate his life and that of the Alsatian saints, reinforcing the symbolic link between the monument and this historical figure.

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