I ran into this hexameter verse by Vergilius when researching for an answer to another question:
exuit, et gressu gaudens incedit Iuli.
The only way I seem to able to scan this line is by taking the fifth foot to be spondee. In my experience this is very rare, so I am in doubt. Wikipedia tells me that spondee in the fifth foot was almost never used by Roman poets, and rarely (5 %) by Homeros.
Is my scansion correct? Should I treat this as a highly exceptional case, or something to be expected from Vergilius?
It just occurred to me, after posting the question, that perhaps Iuli could have three syllables: Ĭ-ū-lī. This would save the dactyl but it sounds otherwise weird.