Yes, the order wasn't German, but there is, afaik, no other order where there were enough Germans in at the time. The German branch of hospitallers, the Johanniterrittern (unsure about spelling), is well known. Anyway, more research is needed before we can decide anything about the knight order units.
BTW, a good combination of triggers for unlocking training of the units in question could be:
1. capture Jerusalem
2. year 1000 or later
3. have at least one cathedral
4. and some more secretstuff to make it slightly more random, perhaps also add a certain time (say 10 turns) from no.1 to no.3 have been achieved until the units become available.
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