History of Christianity
The beginning of the Protestant Reformation is generally identified with Martin Luther and the posting of the 95 Theses in 1517 in Wittenburg, Germany.  Early protest was against corruptions such as simony, episcopal vacancies, and the sale of indulgences.  The Protestant position, however, would come to incorporate doctrinal changes such as sola scriptura and sola fide.  The three most important traditions to emerge directly from the Protestant Reformation were the Lutheran, Reformed (Calvinist, Presbyterian, etc.), and Anglican traditions, though the latter group identifies as both "Reformed" and "Catholic", and some subgroups reject the classification as "Protestant".