Did the ancient Romans eat mice?

Answer 1

Yes.

Generally only those mice and rats bred in captivity - as food - and fed fattening staples like chestnuts and figs, while being kept in large glass containers (similar to a goldfish bowl in design) were eaten.

Answer 2

The dormice, or field mice, were a delicacy and only the wealthy could afford them. The were bred in captivity and kept in large jars; they were fattened up on walnuts, figs, chestnuts, etc. When they were ready they were roasted and glazed with honey and sometimes poppyseed.