Joseph (Dean of Armagh) explained

Joseph^[1] appears as Dean of Armagh^[2] in 1257.^[3]

References

1. http://www.ebooksread.com/authors-eng/james-b-leslie/armagh-clergy-and-parishes--being-an-account-of-the-clergy-of-the-church-of-ire-lse/page-3-armagh-clergy-and-parishes--being-an-account-of-the-clergy-of-the-church-of-ire-lse.shtml Armagh clergy and parishes : being an account of the clergy of the Church of Ireland in the Diocese of Armagh
2. "Fasti Ecclesiae Hibernicae: The succession of the prelates Volume 3" Cotton, H. p30 Dublin, Hodges & Smith, 1848-1878
3. http://www.stpatricks-cathedral.org/people/deans-of-armagh/ St Patrick's Cathedral, Armagh