The development of vowels has been much more complex. One of the most notable series of changes is that known as the Great Vowel Shift, which began around the late 14th century. Here the and in words like "price" and "mouth" became diphthongized, and other long vowels became higher: became (as in "meet"), became and later (as in "name"), became (as in "goose"), and became and later (in RP now ; as in "bone"). These shifts are responsible for the modern pronunciations of many written vowel combinations, including those involving a silent final .