About five years elapsed after Hudson's discovery before a colony was firmly fixed on Manhattan Island, which, when fairly started in 1614, was a little palisade fort and four small log houses. The Dutch called their possessions the Niew Netherlands, named the colony Nieu Amsterdam, and the land across the East River was known as Nassau, the earliest name of Long Island. Hudson was so impressed with the Highlands and the Catskills, which he passed in exploring the river, that he named it the "River of the Mountains," but this was changed by the Dutch to Mauritius, in honor of Prince Maurice of Nassau. The Indians along the banks called the river Shatemuc and Cahohatatea. The English, shortly after the discovery, began calling it the Hudson River, but later, it was generally styled the North River to distinguish it from the Delaware or South River; and North River is the name now generally used in New York. The Manhattan colony was of slow growth, and the first Dutch Governor sent out was a Westphalian, Peter Minuit, a thrifty old fellow, who, by again making good use of "schnapps," bought the whole of Manhattan Island in 1626 from the Indians for beads and trinkets valued at sixty guilders, about $25. There were a thousand people there in 1644, making the original Dutch aristocracy of the "Knickerbockers," this name being adapted later from Irving, and they impressed their peculiarities upon the early city; but their descendants have largely given place to a newer aristocracy of wealth and an army of immigrants from all races. The last Dutch Governor, Peter Stuyvesant, arrived in 1647, and for protection the colonists had then built a fence across the island along what is now the line of Wall Street. An Indian scare a few years later caused this to be replaced with a wall of cedar palisades, and it ultimately developed into the city wall. Thus enclosed, the Mayor of New Amsterdam was required to walk around the walls every morning at sunrise, unlock the gates and give the keys to the commander of the fort down at the Battery. When the Duke of York's English expedition came over in 1664 and overturned the government of old Stuyvesant, surnamed "Peter the Headstrong," and his Knickerbockers, at the same time changing the city's name to New York, it had three hundred and eighty-four houses, and in 1700 the population had increased to about six thousand. The first English Governor was Sir Edmund Andros.