Just in time for the 2054th anniversary of the "noblest Roman"'s finest hour, the British Museum is showing the famous Eid Mar coin, minted by Brutus as he and Cassius rallied republican forces in Greece. The coin, on loan from a private collector, is one of only two gold pieces bearing the famous Phrygian cap and daggers, and it is the only one regarded as authentic. (BTW, it would make a lovely birthday gift for the anti-Caesarians among your friends and family...)