Use "bulla" in a sentence

1. A Bulla is a clay seal bearing a stamp with an individual’s name

2. The Golden Bull (so called because of the pendent gold seal, bulla aurea) was a decree of the Emperor Charles IV, issued at the diet in Metz, in 1336, determining the choice of emperors by a majority of the seven electors, whom it designated

3. The bulla aurea is still preserved in the «Römer» at Frankfort