Bulla (Boule, a Bullet)
Bulla (Boule, A Bullet)
is a seal made of two circular pieces of lead, and attached to papal documents, which at length took the same name. Ecclesiastical seals were usually oval until the 14th and 15th centuries, when they became circular;
and up to the 13th century the seal was suspended by silk threads or a slip of parchment; but was then attached to the document.