Step 1: Understanding the Concept:
The question asks to identify the author of the treatise Dasharupaka, a significant work on Sanskrit dramaturgy and criticism.
Step 2: Detailed Explanation:
The Dasharupaka is a 10th-century text that deals with the principles of dramatic composition ('natya' or 'rupaka'). It elaborates on the ten types of drama first mentioned in Bharata's Natyashastra. This important work of dramatic criticism was written by Dhananjaya, who was a scholar in the court of the Paramara king Munja.
Step 3: Final Answer:
The Dasharupaka is the work of Dhananjaya.