Manuscript BNF f.fr. 837 (manuscript C)
The Châtelaine de Vergy appears in 20 different manuscripts. The manuscript chosen as the basis for the Dufournet/Dulac edition is manuscript C (BNF f. fr. 837) - see the editors' discussion of this on pp. 28-29 of your edition. This manuscript is a large collection of 252 texts; the Châtelaine de Vergy appears on folio 6.
Browse a copy of manuscript BNF f. fr. 837 here. If you want to see the list of contents for the manuscript, click on 'Detailed information' in the top right-hand corner.
British Museum: Chatelaine de Vergi Casket
An ivory casket depicting scenes from the Châtelaine de Vergy (mentioned in the first lecture)
The Metropolitan Museum of Art: Chatelaine de Vergi Casket
Another example of an ivory casket depicting scenes from the text...
Yet another example of an ivory casket (you get the picture...)