This
type is often called a Solar Bird
Fibula. Bird because of the four bird heads, but solar because of the round form and fact that overall it, like the similar but earlier swastika, was a solar symbol.
Similar
types were used from the 5th-7th c AD and are found from the Caucasus to southern
France. They are generally considered Germanic.
This specific form was used by the
Germanic tribes from circa 470/480 into at least the mid-6th century.
While bird
head fibula are too often attributed to the Gepids, it seems that this
type, especially if found in the middle Danubian region is quite likely Gepid, or at least was used by the Gepids among others.
SC