The Vestals made a special salted cake (mola salsa) for this occasion and the day became a bakers' and millers' holiday.
Defeat of Crassus by the Parthians under Surena.
Dio Cassius says this is when Romans first saw silk in the form of Parthian banners ["Silk Roads or Steppe Roads? The Silk Roads in World History," by David Christian; Journal of World History, Vol. 11, No. 1 (Spring, 2000), pp. 1-26 ].
Lest festivals delight the crowd's hearts completely:
Crassus, near the Euphrates, lost the eagles, his army,
And his son, and at the end himself as well.
The goddess said: 'Parthians, why exult? You'll send
The standards back, a Caesar will avenge Crassus' death.'
A. S. Kline translation of Ovid's Fasti
68 A.D. - Nero commits suicide
This Day in Ancient History