Final answer:
King Sihon and King Og were biblical rulers of regions east of the Jordan River, and these territories were conquered by the Israelites and given to the tribes of Reuben, Gad, and half of the tribe of Manasseh.
Step-by-step explanation:
The question "King Sihon and King Og each ruled half of" references a period known in the Bible as the time when the Israelites entered the Promised Land. These two kings ruled over regions east of the Jordan River. King Sihon was the ruler of the Amorites, whose territory included Heshbon and extended northward toward Gilead. King Og ruled the region of Bashan, which was further to the north of Heshbon. These territories would ultimately be conquered by the Israelites under the leadership of Moses and later allotted to the tribes of Reuben, Gad, and half of the tribe of Manasseh.