Born in 347 in Cappadocia, Macrina is remembered by Christians everywhere as an example of faith, love, and wisdom. While she is not as well known as her brothers Basil of Caesarea and Gregory of Nyssa, this woman theologian of the early church made important contributions to Christian practice and thought. With her family, Macrina led the way in condemning slavery and addressing the needs of the poor. Her instruction of her brothers shaped their understanding so that they, in turn, helped formulate what we believe today about the Trinity. Macrina’s story introduces us to this revolutionary family of the fourth century whose lives still touch Christians today.