Which preposition to use with rothesay

in Occurrences 1%

It is said the melancholy news were brought him as he was sitting down to supper in his palace of Rothesay in Bute, and that the effect was such upon his affectionate but feeble spirit, that he drooped from that day forward, refused all sustenance, and died soon after of a broken heart.

Which preposition to use with  rothesay