Saint Ciera of Ireland (alternately Chera, Chier, Cier, Ciara, Cyra, Céire, Keira, Keara, Kiara, Kiera, Ceara, Ciar) was an abbess in the 7th century who died in 679.
Her history is commingled with another Cera (alternately Cier, Ciar, Ciara) who lived in the 6th century.
When a noxious blaze broke out in "Muscraig, in Momonia," St. Brendan instructed the inhabitants to seek Cera's prayers.
Cera was the daughter of Duibhre (or Dubreus) reportedly in the bloodline of the kings of Connor (or Conaire).
He blessed Cera, and instructed her to name the place after St. Telle who had given birth to four children, Matthew, Mark, Luke, and John in the plain of Miodhluachra that day.