I’m thinking somebody may have buried it to keep the barbarian invaders from getting it, but got killed during the invasion therefore the gold stayed in the ground because no-one knew about it except the guy who buried it, and he died.
I’ll go with he was hiding the gold from his wife or ex wife who killed him from vindictive spite
A lot of hoards that are found today, buried for centuries, are probably the result of a murder of the owners.
Which only proves that you should spend most all your money is lavish living, women, whisky, and travel. You can waste the rest.