Step 1: Understanding the Concept: 
The question asks to identify the ruler under whose patronage the Guler school of Pahari painting, known for its naturalism and delicacy, began to flourish. 
Step 2: Detailed Explanation: 
The Guler school is often considered the cradle of the Kangra style of painting. The transition from the bolder Basohli style to the more refined and naturalistic Guler style took place in the early 18th century. This artistic development is strongly associated with the patronage of Raja Govardhan Chand of Guler (reigned c. 1741-1773). Although painting existed in Guler before him, it was during his reign that the school achieved its characteristic delicacy, refinement, and lyrical quality. Artists, possibly from the families of Pandit Seu, Manaku, and Nainsukh, worked at his court and created a new style that would become the foundation for the later Kangra Kalam. 
\[\begin{array}{rl} \bullet & \text{Raja Balwant Singh was the patron of Nainsukh at Jasrota, a different court.} \\ \bullet & \text{Raja Prakash Chand was the son and successor of Govardhan Chand and continued his father's patronage.} \\ \end{array}\]
Step 3: Final Answer: 
The first major phase of Guler painting as a distinct, refined style began under the patronage of Raja Govardhan Chand.
Rearrange the following parts to form a meaningful and grammatically correct sentence: 
P. a healthy diet and regular exercise 
Q. are important habits 
R. that help maintain good physical and mental health 
S. especially in today's busy world