Boissy-sous-Saint-Yon

The Battle of Saint-Denis was fought on 10 November 1567 between a Royalist army and Huguenot rebels during the second of the French Wars of Religion. Although their 74 year old commander, Anne de Montmorency, was killed in the fighting, the Royalists forced the rebels to withdraw, allowing them to claim victory. The only major conflict of the second phase, the battle came about when Montmorency attempted to break Condé's siege of Paris. The Huguenot army retreated towards the border, where they linked up with forces led by their ally John Casimir of the Palatinate-Simmern, before besieging Chartres in February 1568. The war ended shortly thereafter.

Saint-Yon (French pronunciation: [sɛ̃.t‿jɔ̃] ) is a commune in the Essonne department in Île-de-France in northern France. Inhabitants of Saint-Yon are known as Saint-Yonais.

Égly (French pronunciation: [eɡli] ) is a commune in the Essonne department in Île-de-France in northern France around 30 km (20 miles) south of Paris.

Breux-Jouy (French pronunciation: [bʁø ʒwi] ) is a commune in the Essonne department in Île-de-France in northern France. Inhabitants of Breux-Jouy are known as Brojiciens.

Mauchamps (French pronunciation: [moʃɑ̃] ) is a commune in the Essonne department in Île-de-France in northern France. Inhabitants of Mauchamps are known as Campusiens.

Ollainville (French pronunciation: [ɔlɛ̃vil] ) is a commune in the Essonne department in Île-de-France in northern France.

Torfou (French pronunciation: [tɔʁfu] ) is a commune in the Essonne department in Île-de-France in northern France. Inhabitants of Torfou are known as Torfoliens.

Saint-Sulpice-de-Favières (French pronunciation: [sɛ̃ sylpis də favjɛʁ] ) is a commune in the Essonne department in Île-de-France in northern France, located in the metropolitan area of Paris. Inhabitants of Saint-Sulpice-de-Favières are known as Saint-Sulpiciens.

The Arboretum de Segrez is a historic arboretum located within the Domaine de Segrez on Rue Alphonse Lavallée, Saint-Sulpice-de-Favières, Essonne, Île-de-France, France. The arboretum was established in 1857 as a scientific undertaking by Pierre Alphonse Martin Lavallée (1836-1884), a French botanist and horticulturist. It included a herbarium and botanical library, and by 1875 was one of the largest collections of woody plants in the world. After Lavallée's death in 1884, scientific cultivation of the arboretum ceased, but a number of mature specimens can still be seen on the domain's grounds.

Bruyères-le-Châtel (French pronunciation: [bʁɥijɛʁ lǝ ʃɑtɛl] ) is a commune in the Essonne department in Île-de-France in northern France.

Breuillet (French: [bʁøjɛ] ) is a commune in the Essonne department in Île-de-France in northern France. It is located between Arpajon and Dourdan.

Avrainville (French pronunciation: [avʁɛ̃vil] ) is a commune in the Essonne department in Île-de-France in northern France. Inhabitants are known as Avrainvillois.