Fiore de Libera's Flower of Battle (1410) is one of the main sources for people who recreate Historical European Martial Arts (HEMA). While it has a lot of fencing with rapier, cloak, buckler, etc, there's a whole section on unarmed combat. Here's a link to a translation of that section, with images:

http://wiktenauer.com/wiki/Fiore_de%27i_Liberi#Grappling

kampfringen was a German form of unarmed self-defence (ringen = grappling, kampf = struggle). Hans Talhoffer's fighting manual (also the 1400s) includes a section on ringen (link: http://wiktenauer.com/wiki/Talhoffer_Fechtbuch_(Cod.icon._394a)

Just to clarify are you talking about unarmed combat or close quarters combat?