In ancient times people often buried their money in a jar in the ground when conditions were dangerous. That the money was found in modern times as a hoard means the owner never came back to get it. A lot of Roman coin hoards date to the Second Punic War when Hannibal was marching around Italy and large numbers of Romans were getting killed in battles. A.D. 235 is the beginning of a period of about 50 years of frequent barbarian invasions and civil wars in the Roman Empire. These coins may have been buried for safekeeping about the beginning of this period.
Yup.