The church Saint-Hermeland, of an architectural high quality, is one of the first buildings listed(classified) in conformance with(for) historic monuments in France, from 1862. His(Her,Its) sculpted decorations(sets) are among richest and the most various of the Parisian suburb. She(It) is built between 1160 and 1230, in a time(period) of big(great) revival of religious architecture, since Gothic style, that they think invented in the abbey church of Saint-Denis in 1140, is going to allow thanks to technical advances(overhangs) (vault on crossing of ogive, buttressing) to drill walls and to put back(let in) light in churches, supplanting Romance architecture so in Ile-de-France then in all country.
Although more reduced dimensions(size), she(it) is compared with the cathedral Notre-Dame of Paris, on which the parish of Bagneux depended. More or less contemporary, geographically close, they present stylistic similarities which can leave to think that the workers of Notre-Dame worked in Bagneux. She(It) contains spicy(found) funeral paving stones dating the from XIIIth centuries till XVIth centuries, organ loft of the XVIIth century.