Toker led excavations of the Basilica di Santa Maria del Fiore in Florence, Italy from 1970-1974 and again in 1980, which led to discoveries about the tombs of the great Italian artists Giotto and Filippo Brunelleschi, as well as facts about Saint Ambrose, the Bishop of Milan. In light of his more recent discoveries, his lecture will focus on a horseshoe-shaped pool uncovered during the 1912 excavations under the Baptistery of St. John, which Toker has realized could be the archaeological remains of a place in which to hold a baptism, and therefore suggesting the archaeological evidence for the origin of Christianity in Florence. He is documenting his findings in a four-volume "Florence Duomo Project" being published by Brepols Publishers.