The larger towns in New England opened grammar schools, the forerunner of the modern high school. The most famous was the Boston Latin School, which is still in operation as a public high school. Hopkins School in New Haven, Connecticut was another. By the 1780s, most had been replaced by private academies. By the early 19th century, New England operated a network of elite private high schools (now called "prep schools") typified by Phillips Andover Academy (1778), Phillips Exeter Academy (1781), and Deerfield Academy (1797). They became coeducational in the 1970s and remain highly prestigious in the 21st century.