They were probably the work of individual craftsmen working to meet the chieftains' needs. Their place in the chronology of the big cemeteries is indicated by the less richly-decorated double-springed bronze brooches which are found here.

This is a slightly dodgy plan, because there is a lot that is being changed for this fix.

[…] Let some, my Lord, of thy bright Glories beams, Flash quickening Flames of Glory in mine eye T’enquicken my dull Spirits, drunke with dreams Of Melancholy…

`Zip!' Just like that, an exquisitely shaped fragment of a flashing rainbow in flight flits across in front of us[.]