Looks Like Roman

The top one is certainly Roman, looks like being from the family of Constantine (ie first half of 4th century).
Slightly better pictures and I could identify it - some with better eyes maybe able to do it from the pictures given.

The second one could be one of several possibilities, by the flan structure Byzantine, Arab, Indian or even Spanish.
If I am right there is a crown visible on top of the bottom picture which would point towards Spanish coinage of the late 16th or 17th century.

The first was is Roman but would need a little cleaning before I'm able to tell who it is for sure. You can either soak the coin in distilled water or in olive oil for a few weeks. Than using a soft brush, brush off the dirt.

I have no idea what the second coin is.

For the roman coin : http://www.wildwinds.com/coins/ric/i.html