North-west corner (left bottom) on the map of Dheulland (1552) with the porte Montmartre, Ferme de la Grange-Batelière, the Château des Porcherons and Arcans bridge over the ruisseau de Ménilmontant - Grand Égout between them. We see also the chapelle des Martyrs and the church Saint-Pierre de Montmartre. The scale is deformed in order to put them on the plan, because they are more in the north (on the left).