Answer

He first became king of Champanagar (Champanagari). In the Jain story, after regaining his health and later reclaiming his throne, Śrīpāl ruled Champanagar. ( jainbelief.com)

Explanation

The story says that Champanagari was his original kingdom, and after his recovery and later victory over his uncle Ajitsen, he took back that kingdom. ( jainbelief.com)

Spiritual Understanding

This episode in Śrīpāl’s life is often remembered in Jain tradition as a story of faith, karma, and perseverance. ( jainsite.com)

Takeaway

So the short answer is: Champanagar. ( jainbelief.com)