The Ten Lost Tribes were the ten of the Twelve Tribes of Israel that were said to have been exiled from the Kingdom of Israel after its conquest by the Neo-Assyrian Empire BCE. These are the tribes of Reuben, Simeon, Dan, Naphtali, Gad, Asher, Issachar, Zebulun, Manasseh, and Ephraim; all but Judah and Benjamin (as well as some members of Levi, the priestly tribe, which did not have its own territory). However, since the tribe of Simeon lived well within the territory of Judah, it is not clear why this tribe was never included in this list (or as a part of the northern kingdom of the 10 tribes). Also, the tribes of Asher and Reuben were never mentioned as participating in anything after the conquest, living in either Phoenician (Asher) or Moabite (Reuben) controlled territory. By the middle 9th century BCE the territory of Gad was also (re)taken by the Moabites (see Mesha Stele), so the Assyrians could at most have removed the other six tribes. Thus, the "10 tribes" appears to be a misnomer, meaning all of the Israelites that were living outside the Kingdom of Judah. The Jewish historian Josephus (37–100 CE) wrote that "there are but two tribes in Asia and Europe subject to the Romans, while the ten tribes are beyond Euphrates till now, and are an immense multitude, and not to be estimated by numbers".
In the 7th and 8th centuries CE, the return of the lost tribes was associated with the concept of the coming of the messiah. Claims of descent from the "lost tribes" have been proposed in relation to many groups, and some religions espouse a messianic view that the tribes will return.
According to contemporary research, the Transjordan and the Galilee did witness large-scale deportations, and entire tribes were lost. Historians have generally concluded that the deported tribes assimilated into the local population. In Samaria, on the other hand, many Israelites survived the Assyrian onslaught and remained in the land, eventually forming the Samaritan community. However, this has not stopped various religions from asserting that some survived as distinct entities. Zvi Ben-Dor Benite, a professor of Middle Eastern history, states: "The fascination with the tribes has generated, alongside ostensibly nonfictional scholarly studies, a massive body of fictional literature and folktale." Anthropologist Shalva Weil has documented various differing tribes and peoples claiming affiliation to the Lost Tribes throughout the world.
Scriptural basis
The scriptural basis for the idea of lost tribes is : "In the ninth year of Hoshea, the king of Assyria took Samaria, and carried Israel away unto Assyria, and placed them in Halah, and in Habor, on the river of Gozan, and in the cities of the Medes."
According to the Bible, the Kingdom of Israel and Kingdom of Judah were the successor states to the older United Monarchy of Israel. The Kingdom of Israel came into existence c. 930 BCE after the northern tribes of Israel rejected Solomon's son Rehoboam as their king. Nine tribes formed the Kingdom of Israel: the tribes of Reuben, Issachar, Zebulun, Dan, Naphtali, Gad, Asher, Ephraim, and Manasseh.
The tribes of Judah and Benjamin remained loyal to Rehoboam, and formed the Kingdom of Judah. In addition, members of the Tribe of Levi were located in cities in both kingdoms. According to , members of the tribes of Ephraim, Manasseh, and Simeon fled to Judah during the reign of Asa of Judah (c. 911–870 BCE).
In c. 732 BCE, the Assyrian king Tiglath-Pileser III sacked Damascus and Israel, annexing Aramea and territory of the tribes of Reuben, Gad and Manasseh in Gilead including the desert outposts of Jetur, Naphish, and Nodab. People from these tribes were taken captive and resettled in the region surrounding the Khabur River. Tiglath-Pilesar also captured the territory of Naphtali and the city of Janoah in Ephraim, and an Assyrian governor was placed over the region of Naphtali. According to and , the population of Aram and the annexed part of Israel was deported to Assyria.
Israel Finkelstein estimated that only a fifth of the population (about 40,000) were actually resettled out of the area during the two deportation periods under Tiglath-Pileser III, Shalmaneser V, and Sargon II. Many also fled south to Jerusalem, which appears to have expanded in size fivefold during this period, requiring a new wall to be built, and a new source of water (Siloam) to be provided by King Hezekiah. Furthermore, explicitly mentions northern Israelites who had been spared by the Assyrians—in particular, members of Dan, Ephraim, Manasseh, Asher, and Zebulun—and how members of the latter three returned to worship at the Temple in Jerusalem at that time.