How tall were medieval knights?

[fernando]

Originally Posted by pallas

... I heard that the norse and swedes of the viking age were decently porportioned fellows ...

Going a bit backwards, the Lusitanians, probably the most typical pre-Roman warrior race group who inhabited part of what would be Portugal, were rather thick and small.
On the other hand Germans were consensualy rather tall ... eventually much taller than Romans.
Can't it be assumed that, the variable height of individuals, departs from the relative pattern of the different peoples/races stature?
That is, besides the fact that a good diet and heavy training strenghtens and stretches limbs and even body dimensions, a well fed and exhaustively trained nobleman from Lusitanian origins produces a knight not so tall as a German could be.
... Generaly speaking .