Yon is a word still used, though not terribly frequently, I admit, here in Wales.
I had no idea it was so unfamiliar to others !
The Free Dictionary gives some useful examples:
Adj. 1. yon - distant but within sight (`yon' is dialectal); "yonder valley"; "the hills yonder"; "what is yon place?"
Adv. 1. yon - at or in an indicated (usually distant) place (`yon' is archaic and dialectal); "the house yonder"; "scattered here and yon"- Calder Willingham
hence, "round yon virgin" would mean "around the Virgin , some distance away".