Elicision

For this line… which is dactylic hexameter…

when figuring out the feet and how the meter goes… would you elight the O’s because they fall before H’s ? I am wondering if there is a general rule whether you would leave them, or not, since it is vocative.

Hymen O Hymenaee, Hymen ades O Hymenaee!


Hymen (O) Hymenaee, Hymen ades (O) Hymenaee!

Usually long vowels and diphthongs are not elided, and elision is always optional. You certainly wouldn’t want to elide “O” because then you wouldn’t have anything left of the word!