It has been estimated that well over half the books published during the sixteenth century were in Latin. Many have never been translated and hence garnered little scholarly attention. However, a good number of them have a direct bearing on the history of the religious Reformation and its actors. One of these is Roger Ascham s Apologia pro Caena Dominica , a theological tract on the Eucharist which trenchantly attacked the Catholic Mass and sacrificing priests. Composed in Cambridge at the start of Edward VI s reign in 1547, it was published posthumously some thirty years later in 1577. Here for the first time Lucy Nicholas offers a modern edition of Ascham s Apologia that sets forth the Latin original with parallel English translation.".