Guillemin

Thither likewiſe came all the Cleargie, of the Pariſhes and Monaſteries in Paris, and in manner of Proceſſion, filled with griefe and lamentations, brought the Body from the Church of the Guillemins, and carried it to the Church of the Celeſtines, the Eſquires of the deceaſed Duke carrying lighted Torches all the way before the Body.

Source: wiktionary

The whole of the princes who were at Paris, except the king and his children, […] having assembled with a large body of the clergy and nobles, and a multitude of the citizens of Paris, went in a body to the church of the Guillemins.

Source: wiktionary

His death was attended by so many miracles that it became necessary to canonize him; and orders of hermit monks rose up in every quarter, bearing his name of Guillemins, the chief of which were the Blanc Manteaux of Paris.

Source: wiktionary

The notice of Sir John Mandeville given by Bishop Bale in his Catalogue of British Writers, first published in 1548, is chiefly based on his own account of himself, but it ends with the matter-of-fact statement that he died at Liége on 17 Nov. 1372, and was buried there in the church of the Guillelmites, or Guillemins.

Source: wiktionary