The relative adjective "which"

The founder, http://en.wikipedia.org/wiki/Shimazu_Tadahisa (d. 1227), was a son of Shogun http://en.wikipedia.org/wiki/Minamoto_no_Yoritomo (1147-1199) with the sister of http://en.wikipedia.org/wiki/Hiki_Yoshikazu. Tadahisa's wife was a daughter of http://en.wikipedia.org/w/index.php?title=Koremune_Hironobu&action=edit&redlink=1, descendant of the http://en.wikipedia.org/wiki/Hata_clan, whose name Tadahisa took at first. He received the domain of Shioda in http://en.wikipedia.org/wiki/Shinano_Province in 1186 and was then named http://en.wikipedia.org/wiki/Shugo of Satsuma Province. He sent http://en.wikipedia.org/w/index.php?title=Honda_Sadachika&action=edit&redlink=1 to take possession of the province in his name and accompanied Yoritomo in his expedition to http://en.wikipedia.org/wiki/Mutsu_Province in 1189. He went to Satsuma in 1196, subdued Hyuga and Osumi provinces, and built a castle in the domain of Shimazu (Hyuga) which name he also adopted.

I think a comma should be positioned before the relative adjective "which."
So, I'd like to know why a comma is missing before "which" in my example.
Thank you in advance for your help.