Medieval grammarians such as Markandeya (late 16th century) describe a highly systematized Prakrit grammar, but the surviving Prakrit texts do not adhere to this grammar. For example, according to Vishvanatha (14th century), in a Sanskrit drama, the characters should speak Maharashtri Prakrit in verse and Shauraseni Prakrit in prose. But the 10th century Sanskrit dramatist Rajashekhara doesn't abide by this rule. Markandeya, as well as later scholars such as Sten Konow find faults with the Prakrit portions of Rajashekhara's writings, but it is not clear if the rule enunciated by Vishvanatha existed during Rajashekhara's time. Rajashekhara's himself imagines Prakrit as a single language or a single kind of language, alongside Sanskrit, Apabhramsha, and Paishachi.