a town of France, in Touraine, seated at the confluence of the rivers Loire and Maine. The town is mean and ill built; but has been rendered famous in history by the conspiracy of the Protestants in 1560, which opened the fatal wars of religion in France. The castle is situated on a craggy rock, extremely difficult of access, and the sides of which are almost perpendicular. At its foot flows the Loire, which is divided into two streams by a small island. To this fortress the duke of Guise, when he expected an insurrection among the Huguenots, removed Francis II. as to a place of perfect security. Only two detached parts of the ancient castle now remain, one of which was constructed by Charles VIII. and the other by Francis I. The former of those princes was born and died at Amboise. The town is situated E. Long. 1. 30. N. Lat. 47. 25'.