With the birth of Christianity in Ireland, in regard to the older Brehon Civil laws and Pre-Christian customs, efforts were made to assimilate them into the earliest Christian movement in Ireland known as the Céilí Dé or in English the Culdees by its founding Saints/Monks. An example is the ancient practice of crafting a Brigid's cross and the surrounding myths associated with it had been a Imbolc custom associated with the pagan goddesses Brigid, these customs were adopted and incorporated into the early Irish Christian church. Some of the Culdee Saints were brought up in pagan traditions before being converted to the new belief system. One of the most notable leaders of the Céilí Dé in Ireland was Máel Ruain, who had a disciple Óengus the Culdee, a son of a Óengobann, a king of Dál nAraidi, he produced a martyrolgy of Irish Culdee Saints and some non-Irish Saints ina manuscript known as the Félire Óengusso Céli Dé in Tallaght Monastery. Today St. Maelruain's stands on the grounds the original monastery once stood. Máel Ruain and Óengus were said to have been the authors of a text, which sets out the rule of the Céilí Dé monks