Around the start of the second millennium, part of the area was subject to the monastery, linked to St. Nessan, on Ireland's Eye, and around 1039, territories thought to be Portrane, Baldoyle and Raheny were in the possession of the Danish King of Dublin, Sigtrygg Silkbeard, who granted farmland in the area to Christ Church Cathedral, newly established under the first Bishop of Dublin, Donat (at that time the parish itself lay in the Diocese of Glendalough, the proto-Diocese of Dublin being confined to the walled city).