Who was the ruler associated with the court poet Keshav Das?

Raja Madhukar Shah of Orchha

Answer: Raja Madhukar Shah of Orchha
Keshav Das, the composer of 'Rasikapriya,' was the court poet of Raja Madhukar Shah of Orchha.

Rasikapriya, translated as ‘The Connoisseur’s Delight’, is replete with complex poetic interpretations and was composed to incite aesthetic pleasure to elite courtiers. Composed in Brajbhasha by Keshav Das, the court poet of Raja Madhukar Shah of Orchha in 1591, Rasikapriya explores various emotive states, such as love, togetherness, jilt, jealousy, quarrel and its aftermath, separation, anger, etc., that are common between lovers represented through the characters of Radha and Krishna.