Saint Adamnan or Adomnan (625-704) was abbot of the monastery at Iona from 679 to 704. He was the author of The Life of Saint Columba. He was related to Columba, and was also responsible for the Cáin Adomnáin, or the Law of Adomnán. In 700 he convinced 51 kings and 40 spiritual leaders to adopt the law, which changed the relationship between women and priests in Ireland. He also wrote a book, On the Holy Land, wherein he processed the data of a Frankish priest who had paid a visit to Muslim-occupied Syria and Palestine.

His feast day is September 23.