AE4 or BI - Nummus - 11.3 mm ~ 1.0 grams. Leo I made an alliance with the Isaurians and was thus able to eliminate Aspar. In 469, Aspar attempted to assassinate Zeno and very nearly succeeded. Finally, in 471, Aspar's son Ardabur was implicated in a plot against Leo but was killed by palace eunuchs acting on Leo's orders.