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Roman bullae were enigmatic objects of lead, sometimes covered in gold foil, if the family could afford it. A bulla was worn around the neck as a locket to protect against evil spirits and forces. Bullae were made of differing substances depending upon the wealth of the family.
Before the age of manhood, Roman boys wore a bulla, a neckchain and round pouch containing protective amulets (usually phallic symbols), and the bulla of an upper-class boy would be made of gold. Other materials included leather and cloth.
A freeborn Roman boy wore a bulla until he came of age as a Roman citizen. Before he put on his toga virilis ("toga of manhood") he placed his boyhood bulla in the care of his parental household deities (Lares.. Some modern sources interpret Macrobius's single reference to an amulet worn by a triumphal general during his procession as evidence that the childhood bulla was also a standard item of triumphal regalia.
A girl child did not wear a bulla per-se, but another kind of amulet, called a lunula, until the eve of her marriage, when it was removed along with her childhood toys and other things. She would then stop wearing child's clothes and start wearing women's Roman Dress.
A small number of bullae have been found in Ireland; they are called “bullae” based on their resemblance to the Roman form.[a] The Irish bullae so-far found were made of base metal[b] – sometimes clay – covered with a folded over piece of gold foil. The Irish bullae date to the Late Bronze Age, between about 1150 BCE–750 BCE.
They were presumably worn suspended round the neck with a cord running through the hole below the flat top. The body of the bulla has roughly vertical sides before making a semi-circle or inverted pointed arch at the bottom. The gold is incised with geometrical decoration.