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Cod. Pal. germ. 848
Große Heidelberger Liederhandschrift
Codex Manesse, early 14th century
264r Der Tanhuser (Tannhäuser)
Source: Universitätsbibliothek Heidelberg
Teutonic Knight in white mantle and grey cap and tunic.
The Manesse Codex is a book copied and illustrated between 1305 and 1340 in Zürich. It contains love songs in Middle High German by important poets, several of whom were famous rulers. The compilation of the codex was patronized by the Manesse family of Zürich, presumably by Rüdiger II Manesse.
Referenced for 'Teutonic Knight in Habit, 13th Century' in Armies of Feudal Europe 1066-1300 by Ian Heath:
"sergeants of the Order continued to wear grey even thereafter (as too, seemingly, did some knights - the Minnesänger Tannhauser, for instance, whose picture from the early-14th century 'Manessa Codex' is often reproduced in works on the Teutonic Knights, still wears a grey tunic and cap with his white mantle)."