The marvellous palaces to which the Tuatha De Danann retired when conquered by the race of Mil were hidden in the depths of the earth, in hills, or under ridges more or less elevated.[232] At the time of their conquest, Dagda their high king made a distribution of all such palaces in his kingdom. He gave one _síd_ to Lug, son of Ethne, another to Ogme; and for himself retained two--one called _Brug na Boinne_, or Castle of the Boyne, because it was situated on or near the River Boyne near Tara, and the other called _Síd_ or _Brug Maic ind Oc_, which means Enchanted Palace or Castle of the Son of the Young. And this Mac ind Oc was Dagda's own son by the queen Boann, according to some accounts, so that as the name (Son of the Young) signifies, Dagda and Boann, both immortals, both Tuatha De Danann, were necessarily always young, never knowing the touch of disease, or decay, or old age. Not until Christianity gained its psychic triumph at Tara, through the magic of Patrick prevailing against the magic of the Druids--who seem to have stood at that time as mediators between the People of the Goddess Dana and the pagan Irish--did the Tuatha De Danann lose their immortal youthfulness in the eyes of mortals and become subject to death. In the most ancient manuscripts of Ireland the pre-Christian doctrine of the immortality of the divine race 'persisted intact and without restraint';[233] but in the _Senchus na relec_ or 'History of the Cemeteries', from the _Leabhar na h-Uidhre_, and in the _Lebar gabala_ or 'Book of the Conquests', from the _Book of Leinster_, it was completely changed by the Christian scribes.[233]