The term 'Baptism of ___' can be completed with the crossword solutions 'ORDEAL', 'FIRE', 'Piero', 'RITES', and 'RITE'. The Baptism of FIRE is a Christian RITE of passage, which is also known as the ORDEAL of FIRE. This ritual is believed to have originated in the 15th century by Piero della Francesca, an Italian artist and mathematician. It involves a person being baptized with FIRE, and is often accompanied by other RITES such as singing and dancing.