English has gone through many periods in which large numbers of words from a particular language were borrowed. These periods coincide with times of major cultural contact between English speakers and those speaking other languages. The waves of borrowing during periods of especially strong cultural contacts are not sharply delimited, and can overlap. For example, the Norse influence on English began already in the 8th century A.D. and continued strongly well after the Norman Conquest brought a large influx of Norman French to the language.