Marcus Salvius Otho was born on 28 April AD 32 and was Governor of Lusitania AD 58 - 68. He married Poppaea Sabina, future wife of Nero. Otho was hailed emperor in January AD 69; but the legions of the Rhine preferred their own commander Vitellius, for no better reason than that he was their commander. Vitellius' generals defeated Otho's troops at Bedriacum (Cremona) and Otho duly committed suicide on 17th April AD 69.

Main Roman Coin Book and Other References:

RIC = Mattingly, Harold    The Roman Imperial Coinage
BMC = Coins of the Roman Empire in the British Museum
RSC = Seaby, H A    Roman Silver Coinage
RCV = Sear, David R    Roman Coins and Their Values
Cr = Crawford, Michael    The Roman Republican Coinage
SB = Sear, David R    Byzantine Coins and Their Values
S = Coins of England and the United Kingdom
WW = Wildwinds.com (reference & attribution site)