Which preposition to use with deccan

in Occurrences 2%

The latter could not console himself for having been forced to leave the Deccan in the feeble bands of the Marquis of Conflans.

for Occurrences 1%

He took sides in the Deccan for Murzapha Jung, and in the Carnatic for Tchunda Sahib against their rivals supported by the English.

Which preposition to use with  deccan