Marchais (French pronunciation: [maʁʃɛ]) is a commune in the Aisne department in Hauts-de-France in northern France.

The 16th century Chateau de Marchais is a private residence of the Princes of Monaco, since being acquired in 1854 by Charles III.

[4][5] He was accused of treason, though, and to save his life, he surrendered his castle and lands to Charles, Cardindal of Lorraine.

[4] In 1906, Maurice Léger made a prototype helicopter flight at Marchais.

This Laon arrondissement geographical article is a stub.