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Origin and history

The church of Saint-Marse de Bais, located in Ille-et-Vilaine, is dedicated to Saint Marse (or Mars), a sixth-century Breton hermit, disciple of Saint Melaine and former bishop of Nantes. Born in the parish territory, he retired to Bais after giving up his episcopal office, dying there around 535. His relics, preserved in the church until 1427, were transferred to Vitré during the Hundred Years' War and partially returned in 1750 and 1843. The local tradition and stained glass windows of the church celebrate its legendary life, such as the episode of the hosts transformed into a snake.

The present building, classified as a historic monument in 1910, combines elements from the 15th, 16th and 19th centuries. The porch of the sick (1582), the Renaissance portal (1566) and the Gothic nave date back to the 16th century, while the choir and transept, rebuilt in neo-Gothic style by architect Crespel in the 1880s, incorporate old re-used elements. The bell tower dates back to the last quarter of the 15th century. Inside, a 17th century Lavallois altarpiece, classified in 1974, dominates the choir, illustrating the art of Counter-Reform.

The stained glass windows of the last quarter of the 19th century, produced by the Lobin workshops of Tours and Champigneulle in Paris, relate in three main themes: the life of Saint Marse and the cult of his relics (such as the restitution of bones in 1843), Marian and classical devotions (Apparitions of Lourdes, conversion of Saint Paul), and typical piety exercises of the late 19th century. Ten of these windows have been classified since 1982.

The church also preserves an octagonal bentier and a monument to the deaths of the First World War, added by architects Mellet and Coüasnon. Its history reflects the religious and political upheavals, from the revolutionary desecration of 1794 — where a parishioner saved the relics — to the restoration of worship in the 19th century, to the Protestant influences suggested by the iconography of the portal.

The site, owned by the commune, illustrates the architectural and spiritual evolution of a Breton parish, between medieval heritage, Renaissance and neo-Gothic revitalization. Its altarpiece, stained glass windows and porch of the sick bear a remarkable witness to the religious heritage of Ille-et-Vilaine.

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