Tribe of Ephraim
Ephraim became the father of the tribe of Ephraim, distinguished for its warlike valor.
By virtue of its origin, and the promises made by Jacob (Genesis 48) this tribe had an extraordinary development: in population, riches, and power, and for this reason became jealous of the spiritual supremacy of the tribe of Juda.
The tribe of Ephraim precipitated the rebellion and secession from the house of David.
Jeroboam (3 Kings 11) became leader of the ten tribes of the north, and after the schism, the history of the tribe of Ephraim is absorbed in that of the north.
New Catholic Dictionary