A chart of French naval ensigns.

This monumental atlas is made up of three works: ‘Le neptune François’; ‘Cartes marines a l’usage des armées du Roy de la Grande Bretagne’; and ‘Suite du neptune François’. The first two parts were first published by Mortier in 1693, the third was issued by him in 1700.

The first part contains all 12 plates of naval ensigns and 31 charts (two more than called for by Koeman), which detail European waters from the Baltic to Portuguese coast. They are not only more lavish than any of those produced previously, but also are drawn upon Mercator’s Projection – only the second sea atlas to do so. The two extra charts are Mortier’s world map of 1693, and a chart of Europe’s Atlantic coast.