Brahmi

Brahmi is an abugida and uses a system of diacritical marks to associate vowels with consonant symbols. The writing system only went through relatively minor evolutionary changes from the Mauryan period (3rd century BCE) down to the early Gupta period (4th century CE), and it is thought that as late as the 4th century CE, a literate person could still read and understand Mauryan inscriptions. Sometime thereafter, the ability to read the original Brahmi script was lost. The earliest (indisputably dated) and best-known Brahmi inscriptions are the rock-cut edicts of Ashoka in north-central India, dating to 250–232 BCE.