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Dudley’s Remarkable Early Sea Chart of the Strait of Magellan and Tierra del Fuego

Important early chart of the Strait of Magellan and the Strait of Le Maire, the latter of which was first discovered by Jacob Le Maire and Willem Schouten only thirty years prior to the publication of the first edition of this map by Dudley in 1646.

The chart shows the entirety of Tierra del Fuego, shown as one large island with tiny islets dominating the southern shores of the western side of the Strait. These islands are marked as unknown for the most part.

Place names circle Tierra del Fuego, stemming from Schouten and Le Maire’s voyage and from that of the Nodales brothers, who Spain sent to reconnoiter the area after news of the Dutch voyage circulated more broadly. The Dutch were in search of an alternative entrance to the Pacific, as the Strait was supposedly under the charter of the Dutch East India Company.

Dudley has included sounding depths and outlines of sandbars, as well as notes on magnetic declination and sailing directions, including the best times to sail the Strait, underlining the erudite fashion in which his sea atlas was made. However, some myths linger, including the mention of giants. This legend stemmed from reports of large footprints seen by Magellan’s men on the first circumnavigation (1518-1522). Europeans would continue to look for evidence of gigantism until the late-eighteenth century.

The chart provides remarkable detail, including information which would have come to Dudley relatively shortly after Le Maire and Schouten's voyage became publicly known. The map retains the elusive Southern Continent, which is shown in the lower left portion of the map, based upon a description provided by Sir Francis Drake. Drake had been blown far south upon exiting the western entrance to the Strait and supposedly spotted land in the higher latitudes. Dudley had known Drake personally, and had also corresponded with Thomas Cavendish, another English circumnavigator with experience of the Strait, as he was related to him by marriage.

This chart appeared in Dudley’s hugely influential Arcano del Mare, the creation of which is outlined in the biography below. This is an outstanding chart for its early date, showing one of the most strategic waterways in the world, and completed in Dudley’s characteristic graceful style.

Robert Dudley Biography

Robert Dudley (1574-1649) is one of the most intriguing historical figures of the late Elizabethan period. His father, also named Robert and the first Earl of Leicester, was a favorite of Elizabeth I’s. The Earl was a supporter of exploratory expeditions and backed Francis Drake on his circumnavigation (1577-1580) and Martin Frobisher on his 1576 voyage to find the Northwest Passage. Robert the Younger was the illegitimate son of the Earl and Lady Douglas Sheffield, born in 1574.

Dudley attended Christ Church, Oxford, starting in 1587. A year later, at only 14, Dudley stood by his father at Tilbury, witnessing Queen Elizabeth’s famous speech in preparation for resisting the Spanish Armada. His father died in September that year, giving Robert a sizeable inheritance. In 1594, Dudley led an expedition to Guiana, where some of his men explored up the Orinoco River in search of gold. In 1596, Dudley joined an expedition against Cadiz.

All these experiences left Dudley in favor, and he thought the time was right to establish his legitimacy. In court proceedings from 1603 to 1605, Dudley fought for his right to his father’s titles, but the Star Chamber ruled against him and he had to leave England for self-exile in Italy. He settled in Florence, where he designed and built ships and advised Ferdinand I, Grand Duke of Tuscany.

While in Florence, Dudley also compiled all his sailing notes and thoughts on navigation (and those of others including, purportedly, Francis Drake, with whom he sailed in 1596, and Thomas Cavendish, to whom he was related by marriage) into a work called Arcano del Mare, or The Secret of the Sea. He finished the manuscript of the work in 1636 and published the work himself, at age 73, a decade later in 1646-7.

Dudley’s Arcano del Mare (Mystery of the Sea) is one of the most important atlases ever produced and one of the most complex. It is the first sea-atlas of the whole world; the first with all the charts constructed using Mercator's new projection, as corrected by Edward Wright; the first to give magnetic declination; the first to give prevailing winds and currents; the first to expound the advantages of Great Circle Sailing; and the first sea-atlas to be compiled by an Englishman, albeit abroad in Italy. Dudley broke completely with the contemporary style of charts. He showed lines of latitude and longitude and omitted all compass lines. In doing so, his purpose was more intellectual than practical: techniques for determining longitude at sea were not refined until more than two centuries later. The maps are by English and other pilots and it is generally accepted that the work was both scientific and accurate for the time. Dudley used the original charts of Henry Hudson, and for the Pacific Coast of America used Cavendish's observations. The Arcano del Mare was a monumental and totally original task; the charts, representations of instruments, and diagrams all engraved on huge quantities of copper over many years with an exactitude incorporating the minutest detail and printed on the best possible paper.

Antonio Francesco Lucini, the engraver, was born in Florence c. 1610. Before being employed by Dudley, he had already engraved views of Florence and scenes of the Turkish Wars. In a printed introductory leaf found in one copy in the British Library, Lucini states that he worked on the plates in seclusion for twelve years in a Tuscan village, using no less than 5,000 lbs (2,268 kg) of copper.