Better to post each separately in the future as discussion is easier.
Top left: Unknown, looks like
part of a knife
handle or something a
bit larger. Hard to tell though.
Top right: Not
Roman style, simple strap end and likely long after the
Romans, or it could be a simple local manufacture.
Bottom left: This appears to be
part of a hinge fitting for
lorica segmentata amour! The flat, rounded end, with flat head-rivet is unique to 1st-2nd century
lorica segmentata.
Bottom left: damaged remains of a mid-4th century strap end, so-called heart shape or bollocks shape.
SC