In the following sentence, four words printed in bold type are given. One of these words printed in bold may either be wrongly spelt or inappropriate in the context of the sentence. Find out the word that is inappropriate or wrongly spelt, if any. If the words printed in bold are correctly spelt and appropriate in the context of the sentence then mark 'No error’ as your answer.

Once one of the subcontinent’s most politically and culturally important cities, Bijapur is now a small town, perennial to the centre of regional power.