Background:
Bourbonnais was a historic province in the centre of France that corresponded to the modern département of Allier, along with part of the département of Cher. Its capital was Moulins.
The title of the ruler of Bourbonnais between 913 and 1327, was Sire de Bourbon (or Seigneur de Bourbon). The first lord of Bourbonnais known by name was Adhémar (or Aymon I of Bourbon). Aymon\\\'s father was Aymar (894-953), sire of Souvigny, his only son with Ermengarde.Aymar lived during the reign of Charles the Simple who, in 913, gave him fiefs on the Allier River in which would become Bourbonnais. He acquired the castle of Bourbon (today Bourbon-l\\\'Archambault). Almost all early lords took the name d\\\'Archambaud, after the palace, but later the family became known as the \\\"House of Bourbon\\\".
The first House of Bourbon ended in 1196, with the death of Archambault VII, who had only one heir, Mathilde of Bourbon. She married Guy II of Dampierre, who added Montlucon to the possessions of the lords of Bourbon. The second house of Bourbon started in 1218, with Archambault VIII, son of Guy II and Mahaut, and brother of William II of Dampierre. He was followed by his son Archambaut IX, who died in Cyprus in 1249, during a crusade. The House of Burgundy then acquired Bourbonnais.
In 1272, Beatrice of Burgundy (1258-1310), Lady of Bourbon, married Robert de France (1256-1318), Count of Clermont, son of king Louis IX (Saint-Louis). Thus began the long-lasting House of Bourbon, which would provide the kings of France from Henry IV to Louis-Phillipe in 1848, when France abolished its monarchy.
The Bourbons had concluded an alliance with the royal power. They put their forces at the service of the king, thus benefitting from the geographic position of Bourbonnais, located between the royal fidemesne and the duchies of Aquitaine and Auvergne. This alliance, as well as the marriage of Béatrix de Bourgogne and Robert de France, aided the rise and prosperity of the province. In 1327, King Charles (le Bel) elevated Boubonnais to the status of a duchy. (Ref: Koeman; M&B; Tooley)

Mercator, Gerard 1512-94
For nearly sixty years, during the most important and exciting period in the story of modern map making, Gerard Mercator was the supreme cartographer, his name, second only to Ptolemy, synonymous with the form of map projection still in use today. Although not the inventor of this type of projection he was the first to apply it to navigational charts in such a form that compass bearings could be plotted on charts in straight lines, thereby providing seamen with a solution to an age-old problem of navigation at sea. His influence transformed land surveying and his researches and calculations led him to break away from Ptolemy\\\'s conception of the size and outline of the Continents, drastically reducing the longitudinal length of Europe and Asia and altering the shape of the Old World as visualized in the early sixteenth century.
Mercator was born in Rupelmonde in Flanders and studied in Louvain under Gemma Frisius, Dutch writer, astronomer and mathematician. He established himself there as a cartographer and instrument and globe maker, and when he was twenty-five drew and engraved his first map (of Palestine) and went on to produce a map of Flanders (1540) supervising the surveying and completing the drafting and engraving himself. The excellence of his work brought him the patronage of Charles V for whom he constructed a globe, but in spite of his favor with the Emperor he was caught up in the persecution of Lutheran Protestants and charged with heresy, fortunately without serious consequences. No doubt the fear of further persecution influenced his move in 1552 to Duisburg, where he continued the production of maps, globes and instruments culminating in large-scale maps of Europe (1554), the British Isles (1564) and the famous World Map on 18 sheets drawn to his new projection (1569). All these early maps are exceedingly rare, some being known by only one copy.
In later life he devoted himself to his edition of the maps in Ptolemy\\\'s Geographia, reproduced in his own engraving as nearly as possible in their original form, and to the preparation of his 3-volume collection of maps to which, for the first time, the word \\\'Atlas\\\' was applied. The word was chosen, he wrote, \\\'to honor the Titan, Atlas, King of Mauritania, a learned philosopher, mathematician, and astronomer\\\' . The first two parts of the Atlas were published in 1585 and 1589 and the third, with the first two making a complete edition, in 1595 the year after Mercator\\\'s death.

Mercator\\\'s sons and grandsons were all cartographers and made their contributions in various ways to the great atlas. Rumold, in particular, was responsible for the complete edition in 1595. After a second complete edition in 1602, the map plates were bought in 1604 by Jodocus Hondius who, with his sons, Jodocus II and Henricus, published enlarged editions which dominated the map market for the following twenty to thirty years.

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