'Christ belongs to the human race through Mary, his mother, and he is in that sense a sister's son to mankind'. Tomás Ó Cathasaigh, 'The sister’s son in early Irish literature', Peritia, 5 (1986), pp. 128–160, 142.
The Crucifixion was regarded as 'kin-slaying' by the eighth-century poet Blathmac. The Old Covenant was described and seems here to have been understood in Irish legal terms.