TSK · Numbers 32:40

The rest of Gilead and all of Bashan, the kingdom of Og, I gave to half the tribe of Manasseh.(All the region of Argob, that is, all Bashan, is called the land of Rephaim.

The tribe of Manasseh, Joseph’s firstborn son, was also allotted land. The descendants of Makir, Manasseh’s firstborn and the father of Gilead, received land, for they were warriors. They were assigned Gilead and Bashan.