King Kumarpal Solanki was a prominent king of the Chaulukya (Solanki) dynasty, who ruled the region of Gujarat in western India during the 12th century CE (reigning approximately from 1143 to 1172 CE). He is especially revered in Jain tradition for his patronage of Jainism and his close association with the great Jain scholar Acharya Hemachandra.

Under King Kumarpal’s rule, Jainism flourished in Gujarat. He is credited with building and renovating many Jain temples, including important shrines at Shatrunjaya (Palitana), Girnar, and other places. Kumarpal himself is said to have adopted Jainism as his personal faith under the guidance of Acharya Hemachandra, practicing ahimsa (non-violence) and encouraging his subjects to follow Jain ethical principles.

His reign is remembered as a golden era for Jain culture, literature, and architecture. Jain texts such as "Kumarapala Charitra" by Hemachandra and "Prabandhachintamani" by Merutunga describe his life, his devotion to Jain values, and his contributions to the Jain community.

In summary, the kingdom of King Kumarpal Solanki was the region of Gujarat, and his reign is notable in Jain history for the propagation and support of Jainism.