The name of Saint  Barbara was known in Rome in the 7th century; her cult can be traced to the 9th century, at first in the East.
Since there is no mention of her in the earlier martyrologies, her historicity is considered doubtful.

Her legend is included in Vincent of Beauvais' Speculum historiale (xii.64) and in later versions of the Golden Legend (and in William Caxton's version of it).

Various versions, which include two surviving mystery plays, differ on the location of her martyrdom, which is variously given as Tuscany, Rome, Antioch, Baalbek, and Nicomedia.

Saint Barbara is one of the Fourteen Holy Helpers.
Her association with the lightning, which killed her father has caused her to be invoked against lightning and fire; by association with explosions, she is also the patron of artillery and mining.

Her feast on December 4 was introduced in Rome in the 12th century and included in the Tridentine Calendar.
In 1729, that date was assigned to the celebration of Saint Peter Chrysologus, reducing that of Saint Barbara to a commemoration in his Mass. In 1969, it was removed from that calendar, because the accounts of her life and martyrdom were judged to be entirely fabulous, lacking clarity even about the place of her martyrdom.
But she is still mentioned in the Roman Martyrology, which, in addition, lists another ten martyr saints named Barbara.

In the 12th century, the relics of Saint Barbara were brought from Constantinople to the St. Michael's Golden-Domed Monastery in Kyiv, where they were kept until the 1930s, when they were transferred to St. Volodymyr's Cathedral in the same city.

In November 2012, Patriarch Filaret of The Ukrainian Orthodox Church – Kiev Patriarchate brought a small part of St. Barbara's relics to St. Andrew Ukrainian Orthodox Cathedral in Bloomingdale, Illinois.

Her feast day for Roman Catholics,  and Anglicans is December 4.
The name of Saint  Barbara was known in Rome in the 7th century; her cult can be traced to the 9th century, at first in the East. Since there is no mention of her in the earlier martyrologies, her historicity is considered doubtful.
Her legend is included in Vincent of Beauvais' Speculum historiale (xii.64) and in later versions of the Golden Legend (and in William Caxton's version of it).
Various versions, which include two surviving mystery plays, differ on the location of her martyrdom, which is variously given as Tuscany, Rome, Antioch, Baalbek, and Nicomedia.
Saint Barbara is one of the Fourteen Holy Helpers. Her association with the lightning, which killed her father has caused her to be invoked against lightning and fire; by association with explosions, she is also the patron of artillery and mining.
Her feast on December 4 was introduced in Rome in the 12th century and included in the Tridentine Calendar. In 1729, that date was assigned to the celebration of Saint Peter Chrysologus, reducing that of Saint Barbara to a commemoration in his Mass. In 1969, it was removed from that calendar, because the accounts of her life and martyrdom were judged to be entirely fabulous, lacking clarity even about the place of her martyrdom. But she is still mentioned in the Roman Martyrology, which, in addition, lists another ten martyr saints named Barbara.
In the 12th century, the relics of Saint Barbara were brought from Constantinople to the St. Michael's Golden-Domed Monastery in Kyiv, where they were kept until the 1930s, when they were transferred to St. Volodymyr's Cathedral in the same city. 
In November 2012, Patriarch Filaret of The Ukrainian Orthodox Church – Kiev Patriarchate brought a small part of St. Barbara's relics to St. Andrew Ukrainian Orthodox Cathedral in Bloomingdale, Illinois.
Her feast day for Roman Catholics,  and Anglicans is December 4.
Saint Barbara