Beginning with 95 Theses of Martin Luther
Protestant Old Testament contains 39 books(Hebrew Masoretic Text) whereas the Roman Catholic Old Testament(based on Septuagint) contains 46 books
Protestant Leaders
John Calvin
Jan Huss
Martin Luther
John Wyclife
Zwingli, Tyndale, Melanchthon, Beza, Bucer, Bullinger, Chemnitz, Episcopius, Oecolampadius, Cranmer, Menno Simons, Arminius.
Protestant Groups
Lutheran, Reformed, Anglican, Presbyterian, Baptist, Anabaptist, Puritan, and Congregationalist traditions.