The techniques of sparkling winemaking did not originate with the Benedictine monk Dom Pérignon, nor was the first purposely sparkling wine produced in the region of Champagne. Regardless, through centuries of refinement Champagne has become the world’s leading sparkling wine and the vinous embodiment of luxury and celebration.
I haven't seen it all written down in one place, but I am wondering if I have this right from the variety of sources I have read. Chardonnay, Pinot Noir, and Pinot Meunier are the most planted grapes in the champagne region. Pinot Blanc, Petite Meslier, Arbanne, and Fromenteau are currently allowed but no new plantings are permitted unless replacing existing vines. Pinot Rosé and Pinot Juillet (and perhaps a couple of other varieties? Gamay?) were permitted before 2010, but no longer allowed.