How and where did this particular branch develop?

THis Branch developed in Germany in the 16th century when Reformation begun by Martin Luther.

Protestant communities share their Christian beginnings with every other Christian tradition, namely in the life and death of Jesus Christ and in the believing community he established. Nevertheless, they trace their contemporary roots to the corruption of the late medieval Roman Catholic church and to the desire to reform it. In its earliest movements, Protestantism was meant to be an internal renewal, not a new branch of Christianity.The name "Protestant" was coined in 1529 when the Lutheran princes in Germany "protested" against the Diet of Speyer, a meeting that reaffirmed the condemnation of Martin Luther's teachings at the 1521 Diet of Worms. All protestant religions trace their begginings back to the reform begun in 1517 by Martin Luther.