Chemosh is the national God of Moab. Alternatively, the name could be spelled Kemos. Moab was the district East of the Dead Sea, extending from a point some distance North of it to its southern end. The eastern boundary was indefinite, being the border of the desert which is irregular. The length of the territory was about 50 miles and the average width about 30. It is a high tableland, averaging some 3,000 ft. Above the level of the Mediterranean and 4,300 ft. Above that of the Dead Sea.
Lord Chemosh is seen as a war and tutelary deity of the Moabites who are kin to the Hebrews through Lot according to the story in Genesis 19:30-37. He is somehow equated with the Mesopotamian God Shamash. Lord Chemosh like his contemporaries did fight over territory going back and forth between Yahweh and Israel and Molech and the Ammonites.
Eventually his cult was absorbed into the Ares cult with the coming of the Greeks, and Moab was absorbed into the kingdom of the Nabatean Arabs who ruled from Petra.
Story
I am Mesha, son of Kemoshmelek, the king of Moab, the Dibonite. My father was king over Moab for thirty years, and I became king after my father.
And I made this high place for Kemosh in Qarhar . . . because of the deliverance of Mesha, and because he has saved me from all the kings and because he caused me to see [my desire] upon all who hated me. Omri, king of Israel -- he oppressed Moab many days, because Chemosh was angry with his land.
And his son succeeded him, and he also said I will oppress Moab. In my day he spoke according to this word, but I saw my desire upon him and upon his house, and Israel utterly perished forever.
Now Omri had possessed all the land of Medeba and dwelt in it his days and half the days of his son, forty years, but Chemosh restored it in my day. And I built Baal-meon and I made in it the reservoir and I built Kiryathaim. And the men of Gad had dwelt in the land of Ataroth from ofold and the king of Israel had built for himself Ataroth. And I foutht against the city and took it, and I slew all the people of the city, a sight pleasing to Chemosh and to Moab.
And I brought back from there the altar-hearth of Duda and I dragged it before Chemosh in Kiryoth. And I caused to dwell in it the men of Sharon and the men of Meharoth (?).
And Chemosh said to me: "Go take Nebo against Israel"; and I went by night and fought against it from break of dawn till noon, and I took it and slew all, seven thousand men, boys (?), and women, and girls, for I had devoted it to Ashtar-Chemosh.
And I took from there the altar-hearths of Yahweh, and I dragged them before Chemosh. And the king of Israel built Jabaz and dwelt in it while he fought with me and Chemosh drove him out from before me. And I took from Moab two hundred men, all its chiefs, and I led them against Jahaz and took it to add unto Dibon.
And I built Qarhar (?), the wall of the forests and the wall of the hill; and I built its gates and I built its towers, and I built the kings house, and I made the sluices (?) for the reservoir of water in the midst of the city.
And there was no cistern in the midst of the city, in Qarhar (?); and I said to all the people: "Make you each a cistern in his house;" and I cut the cuttings for Qarhar (?) with the help of the prisoners of Israel. I built Aroer and I made the highway by the Arnon. And I built Beth-bamoth, for it had been destroyed. And I built Bezer, for it was in ruins....(Chi) of Dibon wer fifty, for all Dibon was obedient. And I ruled. And I ruled a hundred....in the cities which I had added to the land. And I built [Mede]ba dnd Beth-diblathan. And [as for] Beth-baal-meon, there I placed sheep-raisers....sheep of the land... And [as for] Horonaim there dwelt in it....and.....Chemosh said unto me: "Go down, fight against Horonaim," and I went down and....Chemosh in my day, and from there.....and I.......
Source
Moabite stone - the mesha stele - 930 bc. (2001, September). Retrieved from http://www.piney.com/BabMoabite.html
Moab; moabites. In (1915). J. Orr (Ed.), International Standard Bible Encyclopedia. Retrieved from http://www.bible-history.com/isbe/M/MOAB; MOABITES/
Chemosh. Encyclopedia Mythica. Retrieved June 20, 2013, from Encyclopedia Mythica Online.
http://www.pantheon.org/articles/c/chemosh.html
Shamash. Encyclopedia Mythica. Retrieved June 20, 2013, from Encyclopedia Mythica Online.
http://www.pantheon.org/articles/s/shamash.html
"Table of Gods." . N.p., n.d. Web. 20 June 2013. http://www.eskimo.com/~elladan/gods/.
Jordan, M. (2005). Dictionary of gods and goddesses. (2nd ed., p. 159). Facts on File.