challenge: According to the Martyrology of Tallaght, the Félire Óengusso, and the Martyrology of Gorman, what are the two feast days of Abbán?
  
  A. 16 March and 13 May
  B. 16 March and 27 October
  C. 27 October and 1 January
  D. 13 May and 27 October
  Answer: 