Query: What did Henry Hudson call the river that is now called the Hudson River?
Context: In 1609, English explorer Henry Hudson re-discovered the region when he sailed his ship the Halve Maen ("Half Moon" in Dutch) into New York Harbor while searching for the Northwest Passage to the Orient for his employer, the Dutch East India Company. He proceeded to sail up what he named the North River, also called the Mauritis River, and now known as the Hudson River, to the site of the present-day New York State capital of Albany in the belief that it might represent an oceanic tributary. When the river narrowed and was no longer saline, he realized it was not a maritime passage and sailed back downriver.