I Think They were Germans
Two links shown that describe who the Teutonic Knights were and
who they became.
In short version: They were crusading (Christianity spreading)
fighters of German origins. Originialy founded to defend/spread
Christianity in the Palestine area of current day Israel and the
West Bank. Headquartered around Jeruselem in the year 1118. Now
based in Vienna, Austria, they mostly provide charitable works in
Eastern Europe.
See the links for lots more information:
http://en.wikipedia.org/wiki/Teutonic_Knights
http://www.the-orb.net/encyclop/religion/monastic/opsahl2.HTML