When writing a poem in (my best English approximation of) a classical Latin meter, upon an ancient Roman topic, do I treat the proper names:

1) according to how we tend to pronounce them in English and where the stress falls, or

2) according to the Latin scansion rules of which syllables are short vs. long?

In other words, is “Augusta” stressed on the second syllable, or is it two long syllables followed by a short one, for the purposes of that poem’s scansion?