Before the word pura , when the compound denotes a city of the Eastern People, the final of the final of the first member as the acute accent (udātta).,
Thus ललाट꣡पुरम्, कांची꣡पुरम्, शिवदत्त꣡पुरम्, काणि꣡पुरम्, नामपुरम् ॥ Why do we say 'of the Eastern people'? Observe शिवपुरम् ॥,